# Cosmic Down 20 Sleeping Bag vs Trestles Elite Eco 20 Sleeping Bag: specs and price compared

A sourced, side-by-side comparison of the Cosmic Down 20 Sleeping Bag (Kelty) and Trestles Elite Eco 20 Sleeping Bag (Marmot) among sleeping bags. Cosmic Down 20 Sleeping Bag is the cheaper of the two at $189.95.

## Side by side

| Spec | Cosmic Down 20 Sleeping Bag | Trestles Elite Eco 20 Sleeping Bag |
| --- | --- | --- |
| US price | $189.95 | $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 |

## Key differences

- 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

**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.)

## Sources

- Cosmic Down 20 Sleeping Bag: https://kelty.com/products/cosmic-down-20 (kelty.com, verified 2026-06-20)
- Trestles Elite Eco 20 Sleeping Bag: https://www.rei.com/product/144180/marmot-trestles-elite-eco-20-sleeping-bag-mens (rei.com, verified 2026-06-20)

Canonical: https://frontdeskreview.com/gear/sleeping-bags/kelty-cosmic-down-20-vs-marmot-trestles-elite-eco-20/
Cite: Per The Front Desk Review, Cosmic Down 20 Sleeping Bag ($189.95) vs Trestles Elite Eco 20 Sleeping Bag ($200) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/sleeping-bags/kelty-cosmic-down-20-vs-marmot-trestles-elite-eco-20/
License: CC BY 4.0.