-
Variable Volume
Compresses from about 4L to as much as 30L, from vest to small pack. -
Running-Vest Fit
Sits and carries like a vest, but transfers load like a pack. -
Swappable Padding
Vary the shoulder strap padding thickness, or replace it when it wears out. -
Quick Access
Generous shoulder strap pockets keep gear reachable while you keep moving. -
Removable Load Stabilizers
Dial in how the pack carries, or leave them at home for smaller loads. -
Daisy Chains
Move, add, or remove attachments across the pack body as your setup changes.
Next preorder window opens October 15, 2026
Made in Montana, USA from imported materials.
- Pack overview
- Details
- Specifications
- Sizing info
- Videos
- Shipping
- Warranty
Designed for Movement
The Sassafras Fastpack is designed for activities demanding stability and freedom of movement. It syncs with your motions, riding comfortably with minimal bounce over a wide range of loads, and every pack is hand-sewn from imported fabrics in our small workshop in Montana.
Detailed information
Here you'll find detailed information about the features of the Sassafras. Use the list below to jump to a specific area of interest. Note that some photos may show earlier versions of the pack.
- Configurations
- Pockets
- Features
- Add-on items (available separately)
Versatile Configurations
The Sassafras offers a range of configurations. Hike into base camp, then spend the weekend trail running deep in the mountains with the pack's vest mode.
The tapered width and thickness follow the body's form, narrower and thinner towards the base and thicker around the chest for a more natural weight distribution and feel.
See the 'Videos' tab for a demonstration.
Full Pack
The pack fully expanded, in its default configuration. The roll-top allows for some volume adjustment on top of that.
- For heavier and more voluminous loads, use the y-strap assembly.
- For smaller loads, use only the center strap.
Vest
The pack in its smallest form.
- Fold the side panels inward and secure them to each other using the g-hooks.
- Invert the bottom 4" of the pack (push the bottom of the pack inside itself), then fold the hip belt sleeve over and secure its g-hook to the daisy chain webbing.
- Cinch the shock cord fully and stash the loose ends in a pocket (the center pocket is best).
- Roll the top fully down, or invert it so it sits inside the pack (with this method, the top of the pack stays open).
Remove the y-strap assembly and use only the center strap in this configuration.
Narrow Pack
For the in-between cases. Fold the side panels inward like you do for the vest, but don't invert the bottom: the pack remains at full length. Use the roll-top to get the volume you need.
-Back to menu-Pockets
Shoulder strap pockets
The main shoulder strap pockets are accessible from the top or the side. They're useful for carrying all sorts of things like water bottles, phones, hats, snacks, and so on.
- Top access via cinched opening
- Side access via zipper
- Elastic compression straps help hold items in place and reduce bounce of partially filled soft water bottles.
- Secondary outer pockets for quick access to small items like snacks, gloves or a hat.
Side & Main pockets
These pockets are made from stretchy fabric with an oversized & elasticized top. This allows for good volume while retaining a slimmer profile.
Pockitos
These small pockets on the shoulder straps can hold a variety of items. They are installed at four locations: the top of each shoulder strap and mid-shoulder strap on each side. Examples of what might be carried in them include rain pogies, energy gels, lip balm, a mini satellite communicator, a small knife, or a headlamp.
- Made from lycra mesh
- About 4" deep
- Locations: Top of shoulder straps (2), Mid-shoulder strap (2)
Key Pocket
This zippered pocket on the left side (from the wearer's perspective) of the pack body is a readily accessible place to securely stow your keys and wallet during your trip.
- #3 Aquaguard zipper
Features
Hydration/Stash Sleeve
A water resistant zipper above the shoulder straps gives easy access to an internal sleeve and the pack body, most helpful in running vest mode. It opens on your right side, with elastic bands on the right shoulder strap to keep your hose in place.
- #5 Aquaguard zipper
- A bladder hanger is provided: pass the g-hook through an opening on your bladder and clip it back to the webbing it's mounted on (may not work with all bladders).
- Zipper garage covers the opening when the hose is in use.
Load Stabilizers & Y-strap (removable)
Load stabilizers work with the y-strap to help you tweak how the pack carries. Tightening the stabilizers sucks the weight in closer to your back to better lock it in place. Loosening them reduces constriction. We use them mostly when carrying larger loads when the extension collar is extended above the shoulder straps. When carrying small loads, we often leave them at home and clip the center compression strap directly to the haul loop.
Shock Cord Lashing/Compression (removable)
The shock cord on the rearmost panel provides compression and lashing possibilities. Removable hooks on the cord allow you to configure it as needed, and daisy chains on the sides allow securement of tall items, like tent poles, in your side pockets (wrap one of the free ends of cord around the item, then clip the mitten hook to the daisy chain).
Center Compression Strap
The strap that goes across the top of the pack is removable/interchangeable to allow you to swap out different lengths. For example, when used in vest mode, swap the strap out for a shorter length.
Note that the g-hooks that we use (and metal hardware in general) is hard on webbing so you may see this strap start to wear quickly. Making the strap removable allows easy replacement if needed.
-Back to menu-What's Included
- The pack body
- Y-strap & load stabilizers for tweaking pack carry characteristics
- 2 sternum straps (shock cord style)
- 3/8" shoulder strap padding
- Center compression strap
The included sternum straps are shock cord style for elasticity and good rebound, and can be positioned to suit your fit. Ladder-style cinches on the shoulder straps let you fine-tune strap length on the move.
Add-on items
These add-on items are available separately.
| Item | What it does | Weight added |
|---|---|---|
| Hip belt | Secures the pack and dials in how it carries for more substantial loads. Compatible with modular accessories. We highly recommend it for most users; plenty of people who once swore off hip belts now won't go without it. | 2.5 - 3.3 oz (71 - 94g), depending on size & material |
| Hip stabilizers | Restrict movement of the bottom of the pack and improve load transfer when tightened. Loosen or remove them for more freedom of movement. | ~0.4 oz (12g) |
| Side straps | An alternate way to secure the roll-top and improve stability. | 0.44 oz (12.6g) |
| Feed bag | A cinch-top pouch for snacks or other small items like liner gloves or a hat. 1 L (70 in3). | 0.75 oz (21.3g) |
| Ice axe loop | A lower webbing loop that clips to the daisy chain at the bottom of the pack, plus an upper shock cord cinch lashed to the daisy chain on the pack body. | 0.23 oz (6.4g) |
| Trekking pole stash | A simple shoulder strap addition for stashing z-fold trekking poles on the fly. | ~0.19 oz (5.5g) |
| Shoulder strap padding (1/4" & 1/2") | Swap in thinner or thicker padding than the 3/8" that's included. | n/a |
| Static sternum straps | A non-stretch alternative to the included shock-cord sternum straps. | n/a |
| Center compression strap (extra lengths) | Additional lengths beyond the one included, for different pack volumes. | n/a |
Photos:
-Back to menu-Specifications
Capacity
We feel the Sassafras is best viewed as a ~25L pack; this should give you the most accurate reference for comparison. Pocket volumes are approximate since the fabric is stretchy: figures represent the fabric stretched, but not maxed out.
| Pack body (maximum) | 1830 in3 | 30 L |
| Pack body (minimum) | 240 in3 | 4 L |
| Pack body (ideal) | ~1200-1500 in3 | ~20-25 L |
| Shoulder strap pockets (2) | ~69 in3 | ~1.1 L each |
| Pockitos | ~6 in3 | ~0.1 L each |
| Main pocket | ~170 in3 | ~2.8 L |
| Side pockets (2) | ~70 in3 | ~1.1 L each |
Weight
This is the weight of the pack with all included items; varies by size, and can vary somewhat batch to batch and by color.
| Fabric | Average | Range |
|---|---|---|
| UltraGrid | 21.2 oz | 601g | 20.8 - 21.8 oz | ~590 - 619g |
| Ultra100x | 21.7 oz | 614g | 21.2 - 21.9 oz | ~600 - 622g |
You'll notice the Ultra100x packs come in heavier than the UltraGrid packs despite using a lighter fabric. The weights above reflect what we're actually seeing on finished packs.
Removable items (removing these reduces the spec'd pack weight)
| Y-strap & stabilizer assembly | 0.55 oz | 15.7g |
| Center compression strap | 0.28 oz | 7.9g |
| Shock cord on rear panel | 0.71 oz | 20.1g |
Load recommendations
| Max. load recommendation | <30 lbs | <14 kg |
| Ideal load recommendation | 15-22 lbs | 7-10 kg |
Environmental
| Landfill waste (avg. in-house manufacturing waste) | ~4.0 oz | ~112g |
Materials
The fabrics used in the Sassafras:
Body fabrics
| UltraGrid | Ultra100x | |
|---|---|---|
| Fabric | 210D Recycled nylon | 100d face Ultra-PE blended with high-tenacity polyester |
| Reinforcement | Double 200D Ultra (UHMWPE) grid | Ultra-PE CrossPly |
| Coating/Backing | 1500mm PU | 0.75 mil film |
| DWR | C0 (PFC Free) | n/a |
| Weight | 4.3 oz/yd2 | 146 gsm | 3.9 oz/yd2 | 131 gsm |
| Colors | Blackout, Avocado, Blue Wave, Silverado | Blackout |
Pocket fabrics
| Stretch Mesh | Lycra Mesh | |
|---|---|---|
| Used for | Side & main pockets | Pockitos & outer shoulder strap pockets |
| Composition | Nylon 6.6, UHMWPE, Lycra | 84% Nylon, 16% Spandex |
| Weight | 5.0 - 5.5 oz/yd2 (170 - 186 gsm) | 5.0 oz/yd2 (170 gsm) |
| Color | Black or Heathered | Black |
Stretch Mesh has a UHMWPE ripstop grid woven in to enhance cut resistance.
Sizing Information
To determine the best pack size, it's important to get a good torso and chest measurement.
How to take the measurements
You'll get the best measurements with the help of a friend, but you can still get decent measurements on your own. Taking the measurements a few times to average the results is recommended.
Torso Length:
The distance along your spine from the C7 vertebra to the level of your iliac crest.
- Tilt your head forward and find the bony protrusion at the base of your neck. This is your C7 vertebra.
- Place your hands on your the top of your hips (iliac crest) with your thumbs pointed horizontally toward your back.
- Run a string along your spine from the level of your thumbs to the C7 vertebra.
- Measure the length of the string to determine your torso length.
Chest:
The distance around the fullest part of your chest.
- Stand up straight with your arms by your sides.
- Wrap a string or fabric tape measure around your chest at its widest point, a little below your armpits. This is usually over the nipples and across the shoulder blades.
- Breathe normally and try to keep the tape parallel to the ground.
- Measure the string or note the distance on the tape measure for your chest measurement.
Interpreting your measurements
Torso Length
- Generally you want to match the pack's torso length to your measured torso length.
- There is often a +/- 1" or so wiggle room.
- If you don't plan to add a hip belt, matching the pack's length to your torso is less important. Sizing down (1, maybe 2") is usually preferred over sizing up and may provide a better fit for runners.
Our highest confidence for a good fit occurs for torso lengths falling in the green region.
Chest Size
- Your chest size can affect how far down your front the shoulder straps extend.
- Chest size also affects the length of sternum strap and shoulder strap webbing required.
- Chest sizes falling in the green zone are most likely to fit well with the target torso length pack.
- For larger chest sizes, we do not recommend undersizing the pack's torso length. (see example 1)
- For smaller chest sizes, we do not recommend oversizing the pack's torso length. (see example 2)
- For larger chest sizes, you may benefit from going up a bit in torso length, especially if you fall in between sizes. (see example 3)
Our highest confidence for a good fit occurs for chest sizes falling in the green region.
- Example 1: You have a 19" torso and a 40" chest; we do not advise sizing down to an 18" pack. If you have a ~35" chest, you might be able to get away with it.
- Example 2: You have a 17" torso and a 33" chest; we do not advise sizing up to an 18" pack. If you have a ~37" chest, you might be able to get away with it.
- Example 3: You have an 18" torso and a 41" chest; you may be better off with a 19" pack.
Putting on the pack
When you have a good fit, the hip belt (if used) will sit on or just above your iliac crest and the shoulder straps will curve comfortably around your shoulder without significant airspace between it and your back.
- Start with the shoulder straps, stabilizers, and sternum straps loosened
- Put on the pack
- If using a hip belt, get the hip belt situated where you'd like it to sit.
- Snug up the shoulder straps but don't overtighten.
- Adjust the sternum straps to adjust where the shoulder straps lay (you may need to loosen the shoulder straps).
- Snug up the stabilizers as desired.
What to expect
As a fastpacking pack, the Sassafras may behave a bit differently from more traditional packs.
- The Sassafras is designed to distribute weight evenly to the body rather than routing weight to the hips. When your pack is light enough to allow for running, this provides the best performance. That being said, when hiking with heavier loads, some load transfer is desired and can be achieved by packing your pack so that the contents provide structure. Using hip stabilizers with the hip belt will help achieve even more transfer.
- You may find that the Sassafras has a tendency to ride higher than other packs. This is most prevalent when the pack is low volume and/or when you're running with it. For the former case, it's because you've tightened down the shoulder straps to snug up the fit. In the later case, it's because during running, the pack unweights which causes the hip belt to lift off the hips slightly. Eventually, it will naturally nest in the waist rather than center on the hip crest. While users tend to notice this, it doesn't seem to bother them and should be expected with any pack (with a hip belt) when running. The hip belt's primary function is for load stabilization and additional functionality.
- Most people find that the Sassafras's ideal use case is found when it's loaded to ~15 - 22 lbs, with a mix of hiking and running. This sweet spot is where the pack truly excels.
- An often overlooked method for dialing in your pack's fit is to loosen the sternum straps so that you can tighten the shoulder straps. Inversely, if you feel that the pack is riding too high, try loosening the shoulder straps and tightening the sternum straps to compensate.
How to compress the Sassafras from full volume to running vest:
How to stash your trekking poles on-the-fly:
The pole stash is available separately. This video shows an outdated version of the pole stash, but should give you a general idea of how the process works.
Shipping Information
While most orders ship out within 1 - 3 business days, please allow up to one week for us to ship your order. This gives us some scheduling flexibility for getting out on the trail!*
*If you select seam sealing services with your purchase, please allow a few extra days for us to seal the item(s) and ship your order.
Domestic
We use USPS and UPS for domestic shipping.
(sorry, we're unable to offer shipping by UPS at this time)
| USPS Ground Advantage | USPS Priority | USPS Letter (Free) | ||
|---|---|---|---|---|
| Weight | Any weight | Any weight | Any weight | Stickers & DCF Patches only |
| Expected transit time (business days) |
2 - 5 | 3 - 6 | 2 - 4 | 2 - 6 |
| Tracking? (check your spam folder) |
Yes | Yes | Yes | No |
Notes:
- We may upgrade your shipping method from Ground Advantage to Priority Mail at our discretion and at no extra cost to you.
- Transit time is not guaranteed and does not include the time it takes us to prepare your order for shipment (see top of page) or any posted lead times.
- No UPS shipments to PO Boxes, please; select USPS to ship to your PO Box.
International
We offer shipping via UPS and the US Postal Service (USPS) to the following locations:
- Australia
- Canada
- Chile
- Colombia
- Costa Rica
- Europe (excluding Ukraine & Belarus)
- Hong Kong
- Japan
- Singapore
- Mexico
- New Zealand
- Panama
- Peru
- United Kingdom
| UPS Expedited |
USPS Priority |
USPS First-Class Package |
USPS First Class Mail (letter) |
|
|---|---|---|---|---|
| Restrictions | -- | -- | order value < $400 | Stickers & DCF Patches only |
| Expected transit time (business days) |
2 - 5 | 6 - 10 | varies by destination (often 10 - 25) |
varies by destination |
| Tracking? (check your spam folder) |
yes | USPS Tracking (may be limited after leaving US) | USPS Tracking (may be limited after leaving US) | No |
Notes:
- International shipping fees do not include import duties and fees which may be due upon delivery. We will not mismark values on customs forms.
- In rare cases when the calculated shipping rate significantly differs from the actual rate, we may revise the shipping rate and refund or bill you (with your approval) accordingly.
- Transit time is not guaranteed and does not include the time it takes us to prepare your order for shipment (see the top of the page) or any posted lead times. It's not unusual for parcels to be delayed in customs and this is out of our control.
- Shipments made by USPS will hand over to your country's postal system at Customs; tracking may be limited after the handoff.
- Shipments via UPS may take us several days to hand over to the carrier after the label is processed. This is not included in the transit time.
- International shipping is via FOB Bonner, Montana terms. This means YAMA Mountain Gear is not responsible for lost, damaged, or stolen packages. If you run into a problem with your shipment, please let us know and we'll try to help. Ultimately, however, the customer bears the risk should something go wrong with shipping.
Warranty
We take pride in the quality of our products. Should you, the original owner, ever have a problem with your YAMA brand product due to a defect in workmanship, please contact us to arrange a repair or replacement. The warranty does not cover damage due to accidents, normal wear and tear, or misuse, and the buyer is responsible for all shipping costs and risk of loss or damage during shipment. Repairs not covered by the warranty can usually be performed for a reasonable fee.
YAMA will do its best to address warranty repairs and replacements in a timely manner; however, be aware that YAMA may close periodically, sometimes for extended periods (we need to get out on the trail sometimes!). During these times, if you have a warranty issue, send us an email, and we'll reply as soon as we can. Reasonable efforts will be made to resolve the issue quickly, but in some cases, you will have to wait until the shop reopens.
Please see the product description for any product-specific warranty policies.
YAMA Labs products, and products purchased in the 'Closeouts' section of the store, are not covered by the warranty unless otherwise stated.
Pack overview
Designed for Movement
The Sassafras Fastpack is designed for activities demanding stability and freedom of movement. It syncs with your motions, riding comfortably with minimal bounce over a wide range of loads, and every pack is hand-sewn from imported fabrics in our small workshop in Montana.
-
Variable Volume
Compresses from about 4L to as much as 30L, from vest to small pack. -
Running-Vest Fit
Sits and carries like a vest, but transfers load like a pack. -
Swappable Padding
Vary the shoulder strap padding thickness, or replace it when it wears out. -
Quick Access
Generous shoulder strap pockets keep gear reachable while you keep moving. -
Removable Load Stabilizers
Dial in how the pack carries, or leave them at home for smaller loads. -
Daisy Chains
Move, add, or remove attachments across the pack body as your setup changes.
Details
Detailed information
Here you'll find detailed information about the features of the Sassafras. Use the list below to jump to a specific area of interest. Note that some photos may show earlier versions of the pack.
- Configurations
- Pockets
- Features
- Add-on items (available separately)
Versatile Configurations
The Sassafras offers a range of configurations. Hike into base camp, then spend the weekend trail running deep in the mountains with the pack's vest mode.
The tapered width and thickness follow the body's form, narrower and thinner towards the base and thicker around the chest for a more natural weight distribution and feel.
See the 'Videos' tab for a demonstration.
Full Pack
The pack fully expanded, in its default configuration. The roll-top allows for some volume adjustment on top of that.
- For heavier and more voluminous loads, use the y-strap assembly.
- For smaller loads, use only the center strap.
Vest
The pack in its smallest form.
- Fold the side panels inward and secure them to each other using the g-hooks.
- Invert the bottom 4" of the pack (push the bottom of the pack inside itself), then fold the hip belt sleeve over and secure its g-hook to the daisy chain webbing.
- Cinch the shock cord fully and stash the loose ends in a pocket (the center pocket is best).
- Roll the top fully down, or invert it so it sits inside the pack (with this method, the top of the pack stays open).
Remove the y-strap assembly and use only the center strap in this configuration.
Narrow Pack
For the in-between cases. Fold the side panels inward like you do for the vest, but don't invert the bottom: the pack remains at full length. Use the roll-top to get the volume you need.
-Back to menu-Pockets
Shoulder strap pockets
The main shoulder strap pockets are accessible from the top or the side. They're useful for carrying all sorts of things like water bottles, phones, hats, snacks, and so on.
- Top access via cinched opening
- Side access via zipper
- Elastic compression straps help hold items in place and reduce bounce of partially filled soft water bottles.
- Secondary outer pockets for quick access to small items like snacks, gloves or a hat.
Side & Main pockets
These pockets are made from stretchy fabric with an oversized & elasticized top. This allows for good volume while retaining a slimmer profile.
Pockitos
These small pockets on the shoulder straps can hold a variety of items. They are installed at four locations: the top of each shoulder strap and mid-shoulder strap on each side. Examples of what might be carried in them include rain pogies, energy gels, lip balm, a mini satellite communicator, a small knife, or a headlamp.
- Made from lycra mesh
- About 4" deep
- Locations: Top of shoulder straps (2), Mid-shoulder strap (2)
Key Pocket
This zippered pocket on the left side (from the wearer's perspective) of the pack body is a readily accessible place to securely stow your keys and wallet during your trip.
- #3 Aquaguard zipper
Features
Hydration/Stash Sleeve
A water resistant zipper above the shoulder straps gives easy access to an internal sleeve and the pack body, most helpful in running vest mode. It opens on your right side, with elastic bands on the right shoulder strap to keep your hose in place.
- #5 Aquaguard zipper
- A bladder hanger is provided: pass the g-hook through an opening on your bladder and clip it back to the webbing it's mounted on (may not work with all bladders).
- Zipper garage covers the opening when the hose is in use.
Load Stabilizers & Y-strap (removable)
Load stabilizers work with the y-strap to help you tweak how the pack carries. Tightening the stabilizers sucks the weight in closer to your back to better lock it in place. Loosening them reduces constriction. We use them mostly when carrying larger loads when the extension collar is extended above the shoulder straps. When carrying small loads, we often leave them at home and clip the center compression strap directly to the haul loop.
Shock Cord Lashing/Compression (removable)
The shock cord on the rearmost panel provides compression and lashing possibilities. Removable hooks on the cord allow you to configure it as needed, and daisy chains on the sides allow securement of tall items, like tent poles, in your side pockets (wrap one of the free ends of cord around the item, then clip the mitten hook to the daisy chain).
Center Compression Strap
The strap that goes across the top of the pack is removable/interchangeable to allow you to swap out different lengths. For example, when used in vest mode, swap the strap out for a shorter length.
Note that the g-hooks that we use (and metal hardware in general) is hard on webbing so you may see this strap start to wear quickly. Making the strap removable allows easy replacement if needed.
-Back to menu-What's Included
- The pack body
- Y-strap & load stabilizers for tweaking pack carry characteristics
- 2 sternum straps (shock cord style)
- 3/8" shoulder strap padding
- Center compression strap
The included sternum straps are shock cord style for elasticity and good rebound, and can be positioned to suit your fit. Ladder-style cinches on the shoulder straps let you fine-tune strap length on the move.
Add-on items
These add-on items are available separately.
| Item | What it does | Weight added |
|---|---|---|
| Hip belt | Secures the pack and dials in how it carries for more substantial loads. Compatible with modular accessories. We highly recommend it for most users; plenty of people who once swore off hip belts now won't go without it. | 2.5 - 3.3 oz (71 - 94g), depending on size & material |
| Hip stabilizers | Restrict movement of the bottom of the pack and improve load transfer when tightened. Loosen or remove them for more freedom of movement. | ~0.4 oz (12g) |
| Side straps | An alternate way to secure the roll-top and improve stability. | 0.44 oz (12.6g) |
| Feed bag | A cinch-top pouch for snacks or other small items like liner gloves or a hat. 1 L (70 in3). | 0.75 oz (21.3g) |
| Ice axe loop | A lower webbing loop that clips to the daisy chain at the bottom of the pack, plus an upper shock cord cinch lashed to the daisy chain on the pack body. | 0.23 oz (6.4g) |
| Trekking pole stash | A simple shoulder strap addition for stashing z-fold trekking poles on the fly. | ~0.19 oz (5.5g) |
| Shoulder strap padding (1/4" & 1/2") | Swap in thinner or thicker padding than the 3/8" that's included. | n/a |
| Static sternum straps | A non-stretch alternative to the included shock-cord sternum straps. | n/a |
| Center compression strap (extra lengths) | Additional lengths beyond the one included, for different pack volumes. | n/a |
Photos:
-Back to menu-Specifications
Specifications
Capacity
We feel the Sassafras is best viewed as a ~25L pack; this should give you the most accurate reference for comparison. Pocket volumes are approximate since the fabric is stretchy: figures represent the fabric stretched, but not maxed out.
| Pack body (maximum) | 1830 in3 | 30 L |
| Pack body (minimum) | 240 in3 | 4 L |
| Pack body (ideal) | ~1200-1500 in3 | ~20-25 L |
| Shoulder strap pockets (2) | ~69 in3 | ~1.1 L each |
| Pockitos | ~6 in3 | ~0.1 L each |
| Main pocket | ~170 in3 | ~2.8 L |
| Side pockets (2) | ~70 in3 | ~1.1 L each |
Weight
This is the weight of the pack with all included items; varies by size, and can vary somewhat batch to batch and by color.
| Fabric | Average | Range |
|---|---|---|
| UltraGrid | 21.2 oz | 601g | 20.8 - 21.8 oz | ~590 - 619g |
| Ultra100x | 21.7 oz | 614g | 21.2 - 21.9 oz | ~600 - 622g |
You'll notice the Ultra100x packs come in heavier than the UltraGrid packs despite using a lighter fabric. The weights above reflect what we're actually seeing on finished packs.
Removable items (removing these reduces the spec'd pack weight)
| Y-strap & stabilizer assembly | 0.55 oz | 15.7g |
| Center compression strap | 0.28 oz | 7.9g |
| Shock cord on rear panel | 0.71 oz | 20.1g |
Load recommendations
| Max. load recommendation | <30 lbs | <14 kg |
| Ideal load recommendation | 15-22 lbs | 7-10 kg |
Environmental
| Landfill waste (avg. in-house manufacturing waste) | ~4.0 oz | ~112g |
Materials
The fabrics used in the Sassafras:
Body fabrics
| UltraGrid | Ultra100x | |
|---|---|---|
| Fabric | 210D Recycled nylon | 100d face Ultra-PE blended with high-tenacity polyester |
| Reinforcement | Double 200D Ultra (UHMWPE) grid | Ultra-PE CrossPly |
| Coating/Backing | 1500mm PU | 0.75 mil film |
| DWR | C0 (PFC Free) | n/a |
| Weight | 4.3 oz/yd2 | 146 gsm | 3.9 oz/yd2 | 131 gsm |
| Colors | Blackout, Avocado, Blue Wave, Silverado | Blackout |
Pocket fabrics
| Stretch Mesh | Lycra Mesh | |
|---|---|---|
| Used for | Side & main pockets | Pockitos & outer shoulder strap pockets |
| Composition | Nylon 6.6, UHMWPE, Lycra | 84% Nylon, 16% Spandex |
| Weight | 5.0 - 5.5 oz/yd2 (170 - 186 gsm) | 5.0 oz/yd2 (170 gsm) |
| Color | Black or Heathered | Black |
Stretch Mesh has a UHMWPE ripstop grid woven in to enhance cut resistance.
Sizing info
Sizing Information
To determine the best pack size, it's important to get a good torso and chest measurement.
How to take the measurements
You'll get the best measurements with the help of a friend, but you can still get decent measurements on your own. Taking the measurements a few times to average the results is recommended.
Torso Length:
The distance along your spine from the C7 vertebra to the level of your iliac crest.
- Tilt your head forward and find the bony protrusion at the base of your neck. This is your C7 vertebra.
- Place your hands on your the top of your hips (iliac crest) with your thumbs pointed horizontally toward your back.
- Run a string along your spine from the level of your thumbs to the C7 vertebra.
- Measure the length of the string to determine your torso length.
Chest:
The distance around the fullest part of your chest.
- Stand up straight with your arms by your sides.
- Wrap a string or fabric tape measure around your chest at its widest point, a little below your armpits. This is usually over the nipples and across the shoulder blades.
- Breathe normally and try to keep the tape parallel to the ground.
- Measure the string or note the distance on the tape measure for your chest measurement.
Interpreting your measurements
Torso Length
- Generally you want to match the pack's torso length to your measured torso length.
- There is often a +/- 1" or so wiggle room.
- If you don't plan to add a hip belt, matching the pack's length to your torso is less important. Sizing down (1, maybe 2") is usually preferred over sizing up and may provide a better fit for runners.
Our highest confidence for a good fit occurs for torso lengths falling in the green region.
Chest Size
- Your chest size can affect how far down your front the shoulder straps extend.
- Chest size also affects the length of sternum strap and shoulder strap webbing required.
- Chest sizes falling in the green zone are most likely to fit well with the target torso length pack.
- For larger chest sizes, we do not recommend undersizing the pack's torso length. (see example 1)
- For smaller chest sizes, we do not recommend oversizing the pack's torso length. (see example 2)
- For larger chest sizes, you may benefit from going up a bit in torso length, especially if you fall in between sizes. (see example 3)
Our highest confidence for a good fit occurs for chest sizes falling in the green region.
- Example 1: You have a 19" torso and a 40" chest; we do not advise sizing down to an 18" pack. If you have a ~35" chest, you might be able to get away with it.
- Example 2: You have a 17" torso and a 33" chest; we do not advise sizing up to an 18" pack. If you have a ~37" chest, you might be able to get away with it.
- Example 3: You have an 18" torso and a 41" chest; you may be better off with a 19" pack.
Putting on the pack
When you have a good fit, the hip belt (if used) will sit on or just above your iliac crest and the shoulder straps will curve comfortably around your shoulder without significant airspace between it and your back.
- Start with the shoulder straps, stabilizers, and sternum straps loosened
- Put on the pack
- If using a hip belt, get the hip belt situated where you'd like it to sit.
- Snug up the shoulder straps but don't overtighten.
- Adjust the sternum straps to adjust where the shoulder straps lay (you may need to loosen the shoulder straps).
- Snug up the stabilizers as desired.
What to expect
As a fastpacking pack, the Sassafras may behave a bit differently from more traditional packs.
- The Sassafras is designed to distribute weight evenly to the body rather than routing weight to the hips. When your pack is light enough to allow for running, this provides the best performance. That being said, when hiking with heavier loads, some load transfer is desired and can be achieved by packing your pack so that the contents provide structure. Using hip stabilizers with the hip belt will help achieve even more transfer.
- You may find that the Sassafras has a tendency to ride higher than other packs. This is most prevalent when the pack is low volume and/or when you're running with it. For the former case, it's because you've tightened down the shoulder straps to snug up the fit. In the later case, it's because during running, the pack unweights which causes the hip belt to lift off the hips slightly. Eventually, it will naturally nest in the waist rather than center on the hip crest. While users tend to notice this, it doesn't seem to bother them and should be expected with any pack (with a hip belt) when running. The hip belt's primary function is for load stabilization and additional functionality.
- Most people find that the Sassafras's ideal use case is found when it's loaded to ~15 - 22 lbs, with a mix of hiking and running. This sweet spot is where the pack truly excels.
- An often overlooked method for dialing in your pack's fit is to loosen the sternum straps so that you can tighten the shoulder straps. Inversely, if you feel that the pack is riding too high, try loosening the shoulder straps and tightening the sternum straps to compensate.
Videos
How to compress the Sassafras from full volume to running vest:
How to stash your trekking poles on-the-fly:
The pole stash is available separately. This video shows an outdated version of the pole stash, but should give you a general idea of how the process works.
Shipping
Shipping Information
While most orders ship out within 1 - 3 business days, please allow up to one week for us to ship your order. This gives us some scheduling flexibility for getting out on the trail!*
*If you select seam sealing services with your purchase, please allow a few extra days for us to seal the item(s) and ship your order.
Domestic
We use USPS and UPS for domestic shipping.
(sorry, we're unable to offer shipping by UPS at this time)
| USPS Ground Advantage | USPS Priority | USPS Letter (Free) | ||
|---|---|---|---|---|
| Weight | Any weight | Any weight | Any weight | Stickers & DCF Patches only |
| Expected transit time (business days) |
2 - 5 | 3 - 6 | 2 - 4 | 2 - 6 |
| Tracking? (check your spam folder) |
Yes | Yes | Yes | No |
Notes:
- We may upgrade your shipping method from Ground Advantage to Priority Mail at our discretion and at no extra cost to you.
- Transit time is not guaranteed and does not include the time it takes us to prepare your order for shipment (see top of page) or any posted lead times.
- No UPS shipments to PO Boxes, please; select USPS to ship to your PO Box.
International
We offer shipping via UPS and the US Postal Service (USPS) to the following locations:
- Australia
- Canada
- Chile
- Colombia
- Costa Rica
- Europe (excluding Ukraine & Belarus)
- Hong Kong
- Japan
- Singapore
- Mexico
- New Zealand
- Panama
- Peru
- United Kingdom
| UPS Expedited |
USPS Priority |
USPS First-Class Package |
USPS First Class Mail (letter) |
|
|---|---|---|---|---|
| Restrictions | -- | -- | order value < $400 | Stickers & DCF Patches only |
| Expected transit time (business days) |
2 - 5 | 6 - 10 | varies by destination (often 10 - 25) |
varies by destination |
| Tracking? (check your spam folder) |
yes | USPS Tracking (may be limited after leaving US) | USPS Tracking (may be limited after leaving US) | No |
Notes:
- International shipping fees do not include import duties and fees which may be due upon delivery. We will not mismark values on customs forms.
- In rare cases when the calculated shipping rate significantly differs from the actual rate, we may revise the shipping rate and refund or bill you (with your approval) accordingly.
- Transit time is not guaranteed and does not include the time it takes us to prepare your order for shipment (see the top of the page) or any posted lead times. It's not unusual for parcels to be delayed in customs and this is out of our control.
- Shipments made by USPS will hand over to your country's postal system at Customs; tracking may be limited after the handoff.
- Shipments via UPS may take us several days to hand over to the carrier after the label is processed. This is not included in the transit time.
- International shipping is via FOB Bonner, Montana terms. This means YAMA Mountain Gear is not responsible for lost, damaged, or stolen packages. If you run into a problem with your shipment, please let us know and we'll try to help. Ultimately, however, the customer bears the risk should something go wrong with shipping.
Warranty
Warranty
We take pride in the quality of our products. Should you, the original owner, ever have a problem with your YAMA brand product due to a defect in workmanship, please contact us to arrange a repair or replacement. The warranty does not cover damage due to accidents, normal wear and tear, or misuse, and the buyer is responsible for all shipping costs and risk of loss or damage during shipment. Repairs not covered by the warranty can usually be performed for a reasonable fee.
YAMA will do its best to address warranty repairs and replacements in a timely manner; however, be aware that YAMA may close periodically, sometimes for extended periods (we need to get out on the trail sometimes!). During these times, if you have a warranty issue, send us an email, and we'll reply as soon as we can. Reasonable efforts will be made to resolve the issue quickly, but in some cases, you will have to wait until the shop reopens.
Please see the product description for any product-specific warranty policies.
YAMA Labs products, and products purchased in the 'Closeouts' section of the store, are not covered by the warranty unless otherwise stated.