How to Choose Sleeping Bags for Backpacking
Sierra Designs Nitro 35 Sleeping Bag - Long
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Classic mummy shape and a simple construct are the hallmarks of the long Sierra Designs Nitro 35 bag. It's built for backpackers who put a premium on straightforward tech, low weight and high comfort.
Shop similar productsKey Details
Fill
800-fill-power DriDown down
Weight
1 lb. 8 oz.
Temperature Rating (F)
35 degrees (F)
- Designed with durable 15-denier ripstop nylon and insulated with PFC-free, hydrophobic, 800-fill-power DriDown™ 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 getting in and out easy
- 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 | 27 degrees (F) - ISO |
| Tested Comfort | 37 degrees (F) - ISO |
| Temperature Rating (F) | 35 degrees (F) |
| Temperature Rating (C) | 3 degrees (C) |
| Weight | 1 lb. 8 oz. |
| Shell | 15-denier ripstop nylon |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 800-fill-power DriDown down |
| Fill Weight | 10.1 ounces |
| Lining | 15-denier ripstop nylon |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | 78 inches |
| Shoulder Girth (in.) | 64 inches |
| Hip Girth (in.) | 58 inches |
| Stuff Sack Size | 7 x 13 inches |
| Gender | Unisex |
Buying Advice
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Matt
Sacramento, CA
Pretty warm for a 35 degree bag.
1 year ago
Got it for my brother and so far used it on a few higher elevation summer trips in a tent. He says it's plenty warm, the "foot hole" is convenient, and it packs down small for backpacking (much better than his 20 degree synthetic - this one actually fits in the pack). I was a bit concerned about the spotty insulation fill that you can see if you hold it up to a light, but he says so far it hasn't made a difference he can notice.
Yes , I recommend this product