# Cosmic Down 20 Sleeping Bag vs REI Co-op Trailmade 20 Sleeping Bag: specs and price compared

A sourced, side-by-side comparison of the Cosmic Down 20 Sleeping Bag (Kelty) and REI Co-op Trailmade 20 Sleeping Bag (REI Co-op) among sleeping bags. REI Co-op Trailmade 20 Sleeping Bag is the cheaper of the two at $100.

## Side by side

| Spec | Cosmic Down 20 Sleeping Bag | REI Co-op Trailmade 20 Sleeping Bag |
| --- | --- | --- |
| US price | $189.95 | $100 |
| Brand | Kelty | REI Co-op |
| Released | 2024 | — |
| Temperature rating f | 20 | 21 |
| Insulation type | down | synthetic |
| Fill power | 550 | — |
| Shape | semi-rectangular | mummy |
| Packed weight (lb) | 2.44 | 3.29 |
| Packed size | 8 x 13 in | 10 x 13 in |
| Zipper side | right | — |
| Product note | 550-fill DriDown; ISO comfort 31F, lower limit 21F; regular weight 2 lb 7 oz | Replaced the discontinued Trailbreak 20; recycled synthetic insulation; ISO Lower Limit 21F, Comfort 31F |

## Key differences

- Temperature rating f: Cosmic Down 20 Sleeping Bag 20 vs REI Co-op Trailmade 20 Sleeping Bag 21
- Insulation type: Cosmic Down 20 Sleeping Bag down vs REI Co-op Trailmade 20 Sleeping Bag synthetic
- Shape: Cosmic Down 20 Sleeping Bag semi-rectangular vs REI Co-op Trailmade 20 Sleeping Bag mummy
- Packed weight (lb): Cosmic Down 20 Sleeping Bag 2.44 vs REI Co-op Trailmade 20 Sleeping Bag 3.29
- Packed size: Cosmic Down 20 Sleeping Bag 8 x 13 in vs REI Co-op Trailmade 20 Sleeping Bag 10 x 13 in
- Product note: Cosmic Down 20 Sleeping Bag 550-fill DriDown; ISO comfort 31F, lower limit 21F; regular weight 2 lb 7 oz vs REI Co-op Trailmade 20 Sleeping Bag Replaced the discontinued Trailbreak 20; recycled synthetic insulation; ISO Lower Limit 21F, Comfort 31F

## 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)
- REI Co-op Trailmade 20 Sleeping Bag: https://www.rei.com/product/217592/rei-co-op-trailmade-20-sleeping-bag (rei.com, verified 2026-06-20)

Canonical: https://frontdeskreview.com/gear/sleeping-bags/kelty-cosmic-down-20-vs-rei-coop-trailmade-20/
Cite: Per The Front Desk Review, Cosmic Down 20 Sleeping Bag ($189.95) vs REI Co-op Trailmade 20 Sleeping Bag ($100) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/sleeping-bags/kelty-cosmic-down-20-vs-rei-coop-trailmade-20/
License: CC BY 4.0.