Kelty
Cosmic 20
Manufacturer list price (MSRP)
$189.95
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Overview
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.
Specs
- Brand
- Kelty
- Weight
- 1106 g · 39.0 oz
- Temp rating
- 20°F / -7°C — manufacturer's stated rating (Kelty), not independently tested; the maker publishes no ISO 23537 or EN 13537 figure
- Fill
- 550 fill power down
- Fill power
- 550
- Fill weight
- 16.4 oz / 464 g (Regular)
- Shape
- Mummy
- Packed size
- Stuff sack 8 x 13 in / 20 x 33 cm (Regular)
- Type
- Down mummy sleeping bag
- Fill Material Type
- Down
- ISO 23537 comfort rating
- not published by the manufacturer
- ISO 23537 limit rating
- not published by the manufacturer
- Item Weight
- 2.6 pounds
- Material
- PFC-free DWR, [lining] 50D polyester, [shell] 20D nylon
- Seasons
- 3 Seasons
- Shell fabric
- Recycled 20D nylon taffeta
- Shell Material:
- 20D Recycled Polyester Taffeta
- Fill Material — Source: manufacturer · checked 2026-08-11
- Fill Power — Source: manufacturer · checked 2026-08-11
- Fill Weight G — Source: manufacturer · checked 2026-08-11
- Iso Comfort F — Source: manufacturer · checked 2026-08-11
- Iso Limit F — Source: manufacturer · checked 2026-08-11
- Material Primary — Source: manufacturer · checked 2026-08-11
- Packed Size — Source: manufacturer · checked 2026-08-11
- Product Type — Source: manufacturer · checked 2026-08-11
- Season Rating — Source: manufacturer · checked 2026-08-11
- Shape — Source: manufacturer · checked 2026-08-11
- Shell Material — Source: manufacturer · checked 2026-08-11
- Temperature Rating F — Source: manufacturer · checked 2026-08-11
- Weight G — Source: manufacturer · checked 2026-08-11
Weight vs. category
27% heavier than the category average.
How it measures up
Against every one of the sleeping bags & quilts in the RidgeNote register with a published figure. Manufacturer-listed; sources and dates are on this page.
- Weight
- 2.44 lb (1106 g)
- Lighter than 32% of 25 weighed · #17 lightest
- +16% vs the median 2.09 lb
- Price
- $189.95
- Cheaper than 87% of 30 priced · #3 cheapest
- -48% vs the median $364.00 · $4.87/oz (median $8.02/oz)
- Temperature rating
- 20 °F
- Lower than 42% of 48 rated
- median 20 °F
The lightest of the sleeping bags & quilts on record is Gossamer Gear Cumulus x Gossamer Gear Aerial 330 Sleeping Bag at 11.6 oz — 777 g less for $209.05 more.
The cheapest is Sea to Summit Boab Synthetic Sleeping Bag at $124.00 — $65.95 less and 204 g heavier.
RidgeNote verdict
Similar — lighter or cheaper
Compared with
Side by side on weight, list price and cost per ounce.
Related reading
What Is the Lightest 20 Degree Sleeping Bag in 2026
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What's the Lightest Ultralight Sleeping Bag Worth Buying in 2026?
RidgeNote ranks 24 ultralight sleeping bags and quilts by published weight, from 11.6 oz to 72.0 oz, so you know what going lighter costs in ounces.
What Is the Lightest 30 Degree Sleeping Bag in 2026?
See which 30 degree sleeping bags and quilts weigh least, ranked by grams, ounces, and price per ounce across the full shelf.
Manufacturer list price (MSRP)
$189.95