Kelty
Cosmic Down 20 Sleeping Bag
$189.95Cheaper
Released 2024
Best Sleeping Bags · head-to-head
Cosmic Down 20 Sleeping Bag vs Trestles Elite Eco 20 Sleeping Bag
A sourced, side-by-side comparison. Cosmic Down 20 Sleeping Bag is cheaper at $189.95. Every spec and price links to its source.
Marmot
Trestles Elite Eco 20 Sleeping Bag
$200
Which is better: the Cosmic Down 20 Sleeping Bag or Trestles Elite Eco 20 Sleeping Bag?
The Trestles Elite Eco 20 Sleeping Bag wins 1 of the 1 specs we compare head to head; the other wins 0. The Cosmic Down 20 Sleeping Bag is the cheaper at $189.95. Get the Trestles Elite Eco 20 Sleeping Bag for the stronger spec sheet, the Cosmic Down 20 Sleeping Bag to spend less.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Cosmic Down 20 Sleeping Bag | 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 — Cosmic Down 20 Sleeping Bag: kelty.com (verified 2026-06-20). Trestles Elite Eco 20 Sleeping Bag: rei.com (verified 2026-06-20).
What's the difference between the Cosmic Down 20 Sleeping Bag and 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: Cosmic Down 20 Sleeping Bag down vs Trestles Elite Eco 20 Sleeping Bag synthetic
- Shape: Cosmic Down 20 Sleeping Bag semi-rectangular vs Trestles Elite Eco 20 Sleeping Bag mummy
- Packed weight (lb): Cosmic Down 20 Sleeping Bag 2.44 vs Trestles Elite Eco 20 Sleeping Bag 2.37
- Packed size: Cosmic Down 20 Sleeping Bag 8 x 13 in vs Trestles Elite Eco 20 Sleeping Bag 9.4 x 18.9 in
- Zipper side: Cosmic Down 20 Sleeping Bag right vs Trestles Elite Eco 20 Sleeping Bag left
- Product note: Cosmic Down 20 Sleeping Bag 550-fill DriDown; ISO comfort 31F, lower limit 21F; regular weight 2 lb 7 oz vs 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.
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.
Trestles Elite Eco 20 Sleeping Bag
No sourced tester review yet.