How to Choose Sleeping Bags for Backpacking
Kelty Cosmic Synthetic 40 Sleeping Bag
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A fully equipped mummy bag that's light on weight and your wallet, the Kelty Cosmic Synthetic 40 sleeping bag is a 3-season superstar with CirroLoft synthetic fill for light, compressible warmth.
Shop similar productsKey Details
Fill
CirroLoft synthetic fibers
Temperature Rating (F)
27 degrees (F)
- Buttery-soft and durable nylon shell has a PFC-free durable water repellent (DWR) finish that helps repel moisture to keep you warm and dry inside
- Light, compressible CirroLoft synthetic insulation keeps the overall weight of the bag low without skimping on warmth
- Natural-fit spacious footbox gives you more room to wiggle your toes
- Handy stash pocket gives you a spot to keep your headlamp, cellphone or other small essentials close by
- Included compression stuff sack helps you compact the bag so it takes up less space in your pack
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 the Kelty Cosmic Product LineView all Kelty 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) | 27 degrees (F) |
| Temperature Rating (C) | -2.8 degrees (C) |
| Shell | 20-denier 380T nylon taffeta |
| Zipper Location | Right |
| Insulation Type | Synthetic |
| Fill | CirroLoft synthetic fibers |
| Lining | 50-denier 300T poly taffeta |
| Sleeping Bag Shape | Mummy |
| Stuff Sack Size | 8.5 x 15 inches |
| Stuff Sack Volume | 13.95 liters |
| Gender | Unisex |
