20-Degree Mummy Bag vs Cosmic 20
20-Degree Mummy Bag is the lighter of the two by 306 g (10.8 oz).
Cosmic 20 lists for $460.05 less at the manufacturer's price.
Per ounce carried, Cosmic 20 costs less: $4.87/oz against $23.03/oz.
Weights and prices are the manufacturer’s published figures. The best value in each row is highlighted.
| 20-Degree Mummy Bag Hyperlite Mountain Gear | Cosmic 20 Kelty | |
|---|---|---|
| Weight | 28.2 oz | 39.0 oz |
| MSRP | $650.00 | $189.95 |
| Temperature rating | — | 20°F / -7°C — manufacturer's stated rating (Kelty), not independently tested; the maker publishes no ISO 23537 or EN 13537 figure |
| Price per ounce | $23.03/oz | $4.87/oz |
| Retailers | 1 | 1 |
20-Degree Mummy Bag
Wrap up your day with the 20-Degree Mummy Bag, sewn up to perfection for exceptional warmth, compressibility, and comfort without unnecessary bulk. Premium 1000 fill power grey goose down treated with a DWR finish provides maximum loft and reliable insulation, while 3-dimensional baffles allow the bag to fully loft to 2. 75 inches for efficient heat retention.
Full specs and prices for the 20-Degree Mummy Bag →Cosmic 20
Kelty's Cosmic Down 20 is a 550-fill-power down mummy bag in a semi-rectangular cut, 1106 g in the Regular length. Fill power measures the loft of a given mass of down: 550 is a modest figure, so the bag reaches its rating with more down mass and therefore more weight than an 800-fill bag would. Kelty publishes a 20 F rating as its own number and does not publish ISO 23537 comfort or limit figures, so it cannot be compared directly with bags that do.
Full specs and prices for the Cosmic 20 →