How to Choose Sleeping Bags for Backpacking
Marmot Atom Sleeping Bag
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Great for summer and shoulder-season outings, the Marmot Atom Sleeping Bag is filled with high-quality, water-resistant 800-fill goose down and features a fold-down second zipper for ventilation.
Shop similar productsKey Details
Fill
800-fill goose down
Temperature Rating (F)
40 degrees (F)
- With a European Norm (EN) lower-limit rating of 35.4°F, the Atom Sleeping Bag is suitable for 3-season use
- Certified 800+-fill goose down is treated with Down Defender to improve water resistance in wet conditions
- Sewn-through, smooth-curved, stretch tricot baffles keep down from shifting
- Nautilus multi-baffle hood with drawcord limits heat loss
- Anatomic footbox with wraparound construction increases warmth
- Fold-down second zipper adds ventilation and easy access
- Pertex® Microlight ripstop nylon shell is ultralight yet strong and durable
- Locking YKK 2-way zippers with zip-guard sliders are backed with snagless, insulated draft tubes
- Zipper garage keeps zipper pull in its place during the night
- Internal stash pocket
- 2 hang loops for storing or airing out bag
- Stuff and storage sack included
Imported.
Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.
Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Marmot Backpacking Sleeping BagsEach bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
| Best Use | Backpacking |
|---|---|
| Tested Lower Limit | 35.4 degrees (F) - EN |
| Tested Comfort | 44.1 degrees (F) - EN |
| Temperature Rating (F) | 40 degrees (F) |
| Temperature Rating (C) | 4 degrees (C) |
| Shell | Nylon |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 800-fill goose down |
| Lining | Nylon |
| Sleeping Bag Shape | Mummy |
| Stuff Sack Size | 6 x 12 inches |
| Stuff Sack Volume | 5.6 liters |
| Compressed Volume | Unavailable |
| Gender | Unisex |
