How to Choose Sleeping Bags for Backpacking
Marmot Phase 20 Sleeping Bag
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Enjoy easy sleep when backpacking in frosty temperatures. The Marmot Phase 20 sleeping bag's ultralight fabric and water-resistant down and baffled construction make it the ultimate dream factory.
Shop similar productsKey Details
Fill
Goose down
Temperature Rating (F)
18.5 degrees
- Certified 850-fill-power down insulation with Down Defender to fend off moisture
- Smooth, curved baffles reduce down shifting and cold spots; multi-baffle hood limits heat loss
- Anatomical, wraparound footbox increases insulation and room for your feet, creating more warmth and comfort
- Full-length, locking YKK 2-way zipper with antisnag slider is backed by a snagless insulated draft tube
- Internal stash pocket
- EN tested
- Filled and finished in Rohnert Park, California
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 | 18.5 degrees (F) - EN |
| Tested Comfort | 29.5 degrees (F) - EN |
| Temperature Rating (F) | 18.5 degrees |
| Temperature Rating (C) | -7 degrees |
| Ultralight | Yes |
| Shell | Pertex 10-denier ripstop nylon |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | Goose down |
| Lining | Pertex 10-denier ripstop nylon |
| Sleeping Bag Shape | Mummy |
| Stuff Sack Size | 7.5 x 16 inches |
| Stuff Sack Volume | 11.6 liters |
| Gender | Unisex |
