Kelty
Kelty Cosmic Down 20 Sleeping Bag
$189.95Cheaper
Released 2024
Best Sleeping Bags · head-to-head
Kelty Cosmic Down 20 Sleeping Bag vs Marmot Trestles Elite Eco 20 Sleeping Bag
A sourced, side-by-side comparison. Kelty Cosmic Down 20 Sleeping Bag is cheaper at $189.95. Every spec and price links to its source.
Which is better: the Kelty Cosmic Down 20 Sleeping Bag or Marmot Trestles Elite Eco 20 Sleeping Bag?
The Marmot Trestles Elite Eco 20 Sleeping Bag wins 1 of the 1 specs we compare head to head; the other wins 0. The Kelty Cosmic Down 20 Sleeping Bag is the cheaper at $189.95. Get the Marmot Trestles Elite Eco 20 Sleeping Bag for the stronger spec sheet, the Kelty Cosmic Down 20 Sleeping Bag to spend less.
See Kelty Cosmic Down 20 Sleeping Bag on Amazon See Marmot Trestles Elite Eco 20 Sleeping Bag on Amazon
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Kelty Cosmic Down 20 Sleeping Bag |  Marmot Trestles Elite Eco 20 Sleeping Bag |
|---|---|---|
| US price | $189.95 MSRP, regular size, per kelty.com | $200 |
| Brand | Kelty | Marmot |
| Released | 2024 | — |
| Temperature rating f | 20 | 20 |
| Insulation type | down | synthetic |
| Fill power | 550 | — |
| Shape | semi-rectangular | mummy |
| Packed weight (lb) | 2.44 | 2.37 |
| Packed size | 8 x 13 in | 9.4 x 18.9 in |
| Zipper side | right | left |
| Product note | 550-fill DriDown; ISO comfort 31F, lower limit 21F; regular weight 2 lb 7 oz | HL-ElixR Eco Micro recycled synthetic insulation; dual-zipper with secondary vent zip; ISO comfort 32F, lower limit 21.6F; listed weight 1,077 g |
Sources — Kelty Cosmic Down 20 Sleeping Bag: kelty.com (verified 2026-06-20). Marmot Trestles Elite Eco 20 Sleeping Bag: rei.com (verified 2026-06-20).
What's the difference between the Kelty Cosmic Down 20 Sleeping Bag and Marmot Trestles Elite Eco 20 Sleeping Bag?
Where the two actually differ on the specs we track (6 of 8). Matching specs are omitted.
- Insulation type: Kelty Cosmic Down 20 Sleeping Bag down vs Marmot Trestles Elite Eco 20 Sleeping Bag synthetic
- Shape: Kelty Cosmic Down 20 Sleeping Bag semi-rectangular vs Marmot Trestles Elite Eco 20 Sleeping Bag mummy
- Packed weight (lb): Kelty Cosmic Down 20 Sleeping Bag 2.44 vs Marmot Trestles Elite Eco 20 Sleeping Bag 2.37
- Packed size: Kelty Cosmic Down 20 Sleeping Bag 8 x 13 in vs Marmot Trestles Elite Eco 20 Sleeping Bag 9.4 x 18.9 in
- Zipper side: Kelty Cosmic Down 20 Sleeping Bag right vs Marmot Trestles Elite Eco 20 Sleeping Bag left
- Product note: Kelty Cosmic Down 20 Sleeping Bag 550-fill DriDown; ISO comfort 31F, lower limit 21F; regular weight 2 lb 7 oz vs Marmot Trestles Elite Eco 20 Sleeping Bag HL-ElixR Eco Micro recycled synthetic insulation; dual-zipper with secondary vent zip; ISO comfort 32F, lower limit 21.6F; listed weight 1,077 g
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
Kelty Cosmic Down 20 Sleeping Bag
Two whitelisted hands-on testers (CleverHiker, Switchback Travel) reviewed the Kelty Cosmic Down 20 and both call it a strong-value budget 3-season down bag. Both praise its warmth-to-weight ratio, buttery-soft lining, and low price, and both flag it as heavy and bulky for a backpacking-specific bag while noting the large gap between the women's and unisex versions. CleverHiker's tester observed comfortable warmth to 30F against the 20F spec. All six quotes and the one measured value were verified as literal substrings of the fetched source text. (2 sourced reviews, 2 lab-tested.)
Praised: Excellent warmth-to-weight ratio and cozy, buttery-soft lining; Strong value / affordable for a down bag; Draft collar/tubes and adjustable hood seal in heat well for 3-season use.
Flagged: Heavy and bulky for a backpacking-specific down bag; Large price and weight gap between women's and unisex versions; Narrow mummy fit limits room to spread out.
Marmot Trestles Elite Eco 20 Sleeping Bag
No sourced tester review yet.