Ultra-Sil Day Pack

Packs down to the size of a tennis ball

$32.95

20 liter20 liter
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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.

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Description

The Ultra-Sil™ Day Pack won the Backpacker Editors' Choice Gold Award in 2017, meaning this little pack has stood the test of time and sustained its best-in-class status for more than 5 years. It is perfect for a summit pack, carrying groceries when on foot, on a bike or as an extra traveling tote. The tiny packed size of this perennial best seller fits easily onto your key ring, in a jacket pocket or a purse and the reinforced bar-tacks at all stress points enable it to withstand loads 250 times its own weight. A small but mighty essential.

Features

  • The Ultra-Sil Day Pack won the Backpacker Editors’ Choice Gold award, 2017
  • Packs down small so it easily fits in pockets, purses or luggage
  • Stuff sack has an attached carabiner
  • Simple, streamlined design so it's light and low profile
  • Siliconized CORDURA® fabric for strength and durability
  • Bartack reinforced stitching on all stress points
  • Two-way zipper closure
  • Reinforced shoulder straps for increased carrying comfort
  • Webbing daisy-chain attachment point can hold a bike light