Sea to Summit Duffle Bag

Made to go anywhere and survive anything

$119.95 – $179.95

45 liter45 liter
65 liter65 liter
90 liter90 liter
130 liter130 liter

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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Our range of Duffle bags is packed full of Sea to Summit's trademark innovation: clever ideas, robust materials, and quality construction. This is a super burly duffle ideal for rough and tough expeditions and over-landing adventures. It features three versatile carry options that are easy to change - backpack, classic duffle, and shoulder sling - and lash loops for attaching to expedition vehicles, touring motor cycles and animals. A double zipper provides additional security and offers further water resistance, while the extra wide opening allows for easy packing and accessing of gear.

FYI: the 45L Duffle is carry-on size


  • Padded lid opens 40% wider than conventional expedition duffles
  • A taller shape makes packing and unpacking easier
  • Magnets in carrying straps keep them perfectly positioned ready for use in classic duffle carry mode
  • Super tough burly materials used; waterproof tarpaulin laminate, base made of 1000D nylon, steel-gated hooks