Remember trapezoids from 10th-grade geometry? This funky shape is ideal for helping sleeping bag baffles retain heat and is just one of the reasons the Kelty Cosmic Down 0 bag is a 3-season superstar.
Fill
550-fill-power down
Weight
Regular: 4 lbs. 5 oz.
Long: 4 lbs. 10 oz.
Temperature Rating (F)
0 degrees (F)
- Lightweight and warm 550-fill-power down
- Innovative trapezoidal baffle construction improves thermal efficiency
- Buttery-soft and durable 20-denier nylon shell fabric with PFAS-free durable water repellent (DWR)
- Zippered internal stash pocket for headlamp or cellphone
- Zipper draft tube with anti-snag zipper design makes it easy to get in and out
- Dual slider for ventilation with locking zippers
- Natural-fit spacious footbox offers extra room to wiggle your toes
- Comes with stuff sack for quick departures
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 | 4 degrees (F) - ISO |
| Tested Comfort | 17 degrees (F) - ISO |
| Temperature Rating (F) | 0 degrees (F) |
| Temperature Rating (C) | -18 degrees (C) |
| Weight | Regular: 4 lbs. 5 oz. Long: 4 lbs. 10 oz. |
| Shell | 20-denier nylon taffeta |
| Zipper Location | Right |
| Insulation Type | Down |
| Fill | 550-fill-power down |
| Fill Weight | Regular: 2 lbs. 7.5 oz. Long: 2 lbs. 9.6 oz. |
| Sleeping Capacity | 1-person |
| Lining | 50-denier polyester taffeta |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | Regular: 72 inches Long: 78 inches |
| Shoulder Girth (in.) | Regular: 62 inches Long: 64 inches |
| Hip Girth (in.) | Regular: 58 inches Long: 60 inches |
| Stuff Sack Size | 10 x 19 inches |
| Stuff Sack Volume | Unavailable |
| Compressed Volume | Unavailable |
| Gender | Unisex |