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Ultra-Sil Stuff Sack

Ultralight and slippery pack organization for the savvy packer and traveler

$11.95 – $19.95

XXS / 2.5 literXXS / 2.5 liter
XS / 4 literXS / 4 liter
S / 6.5 literS / 6.5 liter
M / 9 literM / 9 liter
L / 15 literL / 15 liter
XL / 20 literXL / 20 liter
XXL / 30 literXXL / 30 liter
Forest GreenForest Green
RedRed
Royal BlueRoyal Blue
YellowYellow

Sleeping Bag Temperature Ratings Explained

The EN Rating scale is a scientific test to determine the warmth of a sleeping bag. Unisex sleeping bags list the Lower Limit which is the lowest temperature rating that an average male sleeper would be comfortable in. Our women’s sleeping bags list the Comfort Limit, which is the lowest temperature rating at which an average female sleeper should be comfortable. The comfort and lower limit temperature ratings are listed in the features table on the product page.

For example, a unisex sleeping bag that shows a Lower limit of 23ºF means a man should be comfortable down to air temperatures of 23ºF. The same bag will also have a Comfort limit, in the realm of 32°F, so a woman would be comfortable down to an air temperature of 32ºF. Men and women should always sleep in a layer of long underwear and use a sleeping mat with an R-Value appropriate for expected ground temperatures – without this, the sleeping bag itself is unlikely to keep the sleeper warm enough.


Here’s a basic categorization of appropriate use, based on rated temperatures:
Summer:   >+35ºF / +3°C
3-Season:   +10 to +35ºF / -15° to 0°C
Winter:   <10ºF / -15°C


A huge variety of factors can impact sleeping bag warmth - the above temperatures are merely guidelines, not guarantees. It’s important to think of a sleeping bag as one element in a sleep system which also includes an appropriately insulating sleeping pad and a liner. For instance - if you plan on sleeping in nighttime air temperatures of 27ºF / -3°C, choose a bag with a gender-appropriate rating of 23°F / -5°C nights, plus a sleeping mat with an R-Value of 2.5 to 3, and consider a Reactor thermal liner. If you have any questions about which temperature sleeping bag / R-Value sleeping mat you should select, or how to improve your warmth in a sleep system, reach out to us via our contact page any time.

$11.95

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Description

The Ultra-Sil Stuff Sack is an ultralight but durable solution using a 30D siliconized CORDURA® fabric. Ideal for organizing gear in your pack or bag, these stuff sacks incorporate a reinforced pull handle on the base, a durable pull tab at the top and are available in several great colors. 

Highlights

Packability

Your scale will hardly notice the difference when you start using these

Best Use

Internal pack organization, packing up whatever you feel like belongs in a bag

What this bag could hold

2.5 liter: a phone (in a waterproof case), snacks, wallet & keys
4 liter: some snacks and drinks or extra layers

6.5 liter: a layer and a meal or so worth of food
9 liter: a puffy jacket & a sleeping bag or food for 2-3 days
15 liter: all your clothes for a trip
20 liter: a tent or any Sea to Summit sleeping bag
30 liter: paddle gear, overnight camp equipment or bike gear

Features

  • Made of 30D Diamond RipStop Siliconized CORDURA®
  • The fabric is impregnated with silicone to make it waterproof to a hydrostatic head of 2000mm
  • The fabric has a slippery finish for easy packing
  • Reinforced pull handle on the bottom
  • Uses the smallest possible cord and cord lock for top closure
  • Bar tack reinforced in all stress points
  • All seams are double stitched for extra strength
  • Note: seams are not tape-sealed; therefore this product is not waterproof - only water resistant