How to Choose Sleeping Bags for Backpacking
Kelty Cosmic Down 40 Sleeping Bag
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Great for warm-weather backpacking, the 2-season Kelty Cosmic Down 40 sleeping bag features lofty 600-fill-power DriDown™ insulation that defends against moisture and still compresses small.
Shop similar productsKey Details
Fill
600-fill DriDown
Temperature Rating (F)
40 degrees (F)
- Ripstop polyester creates a smooth yet durable shell; polyester taffeta lining breathes for comfort and feels great against skin
- 600-fill-power DriDown has a water-resistant finish that allows down insulation to resist moisture, dry fast and maintain loft
- 60 in. dual-slider locking zipper with antisnag design and draft tube to hold in warmth
- Thermal comfort hood has drawcords of differing widths at head and neck for easy identification and adjustment in the dark
- Off-set construction provides maximum warmth without cold spots
- Full draft collar drapes comfortably over neck and shoulders, sealing out drafts
- Natural-fit footbox provides plenty of room so feet don't feel scrunched
- Stuff 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 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 | 40 degrees (F) - EN |
| Tested Comfort | 48 degrees (F) - EN |
| Temperature Rating (F) | 40 degrees (F) |
| Temperature Rating (C) | 4 degrees (C) |
| Shell | 50-denier ripstop polyester |
| Zipper Location | Right |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 600-fill DriDown |
| Lining | 50-denier polyester taffeta |
| Sleeping Bag Shape | Mummy |
| Stuff Sack Size | 7 x 12 inches |
| Stuff Sack Volume | 7.6 liters |
| Gender | Unisex |
