How to Choose Sleeping Bags for Backpacking
Kelty Cosmic Down 21 Sleeping Bag
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This lightweight sleeping bag is insulated with water-resistant DriDown that resists moisture, has exceptional loft and compresses down small, making it a great bag for backpacking spring thru fall.
Shop newer versionKey Details
Fill
550-fill DriDown
Temperature Rating (F)
21 degrees (F)
- 550-fill-power DriDown has a water-resistant finish that allows down insulation to resist moisture, dry faster and maintain loft
- Box-baffle construction with differential cut and ground-level side seams provides maximum warmth and eliminates cold spots
- Full draft collar drapes comfortably over neck and shoulders, sealing out drafts
- Polyester taffeta creates a smooth yet durable shell; polyester taffeta lining breathes for comfort and feels great against skin
- Formfitting hood has drawcords of differing widths at head and neck for easy identification and adjustment in the dark
- Natural-fit footbox provides plenty of room so feet don't feel scrunched
- Full-length, 2-way, double sliding zipper allows easy venting; locking slider is backed by antisnag binding tape
- Fully insulated draft tube backing the zipper keeps body heat in and cold air out
- Pad loops provide attachment points to keep sleeping bag centered on top of sleeping pad (pad and straps not included)
- Hang loops allow easy drying and storage
- 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 | 21 degrees (F) - EN |
| Tested Comfort | 32 degrees (F) - EN |
| Temperature Rating (F) | 21 degrees (F) |
| Temperature Rating (C) | -7 degrees (C) |
| Shell | 50-denier polyester taffeta |
| Zipper Location | Right |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 550-fill DriDown |
| Lining | 50-denier polyester taffeta |
| Sleeping Bag Shape | Mummy |
| Gender | Unisex |
