A classic mummy shape and a simple construction are hallmarks of this Sierra Designs Nitro 20 sleeping bag. It's made for backpackers who prioritize low weight, high comfort and straightforward tech.
Fill
800-fill-power DriDown
Weight
1 lb. 15 oz.
Temperature Rating (F)
20 degrees (F)
- Designed with durable 15-denier ripstop nylon and insulated with PFC-free, hydrophobic DriDown™ 800-fill-power down to keep you toasty warm, even on damp nights
- A draft collar seals in the heat when moving around, and 5 in. baffle spacing and sidewall baffles prevent the down from shifting and causing cold spots
- Patented self-sealing foot vent provides relief to hot sleepers without the need to kick off the covers
- Anti-snag zipper eliminates sleepy struggles and makes it easy to get in and out
- Closeout
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 Sierra Designs 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 | 17 degrees (F) - ISO |
| Tested Comfort | 28 degrees (F) - ISO |
| Temperature Rating (F) | 20 degrees (F) |
| Temperature Rating (C) | -6 degrees (C) |
| Weight | 1 lb. 15 oz. |
| Ultralight | Yes |
| Shell | 15-denier ripstop nylon |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 800-fill-power DriDown |
| Fill Weight | 14.7 ounces |
| Lining | 15-denier ripstop nylon |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | 72 inches |
| Shoulder Girth (in.) | 62 inches |
| Hip Girth (in.) | 56 inches |
| Stuff Sack Size | 7.3 x 15 inches |
| Gender | Men's |