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

A sourced, side-by-side comparison of the REI Co-op Trailmade 20 Sleeping Bag (REI Co-op) and Spark SpII Ultralight Down Sleeping Bag (Sea to Summit) among sleeping bags. REI Co-op Trailmade 20 Sleeping Bag is the cheaper of the two at $100.

## Side by side

| Spec | REI Co-op Trailmade 20 Sleeping Bag | Spark SpII Ultralight Down Sleeping Bag |
| --- | --- | --- |
| US price | $100 | $409 |
| Brand | REI Co-op | Sea to Summit |
| Temperature rating f | 21 | 28 |
| Insulation type | synthetic | down |
| Fill power | — | 850 |
| Shape | mummy | mummy |
| Packed weight (lb) | 3.29 | 1.17 |
| Packed size | 10 x 13 in | 2.5 L (approx. 1-liter bottle size) |
| Zipper side | — | — |
| Product note | Replaced the discontinued Trailbreak 20; recycled synthetic insulation; ISO Lower Limit 21F, Comfort 31F | Lower limit 28F / -2C; comfort 38F / 4C; Ultra-Dry Down PFAS-free treatment; regular size; 530 g / 18.7 oz |

## Key differences

- Temperature rating f: REI Co-op Trailmade 20 Sleeping Bag 21 vs Spark SpII Ultralight Down Sleeping Bag 28
- Insulation type: REI Co-op Trailmade 20 Sleeping Bag synthetic vs Spark SpII Ultralight Down Sleeping Bag down
- Packed weight (lb): REI Co-op Trailmade 20 Sleeping Bag 3.29 vs Spark SpII Ultralight Down Sleeping Bag 1.17
- Packed size: REI Co-op Trailmade 20 Sleeping Bag 10 x 13 in vs Spark SpII Ultralight Down Sleeping Bag 2.5 L (approx. 1-liter bottle size)
- Product note: REI Co-op Trailmade 20 Sleeping Bag Replaced the discontinued Trailbreak 20; recycled synthetic insulation; ISO Lower Limit 21F, Comfort 31F vs Spark SpII Ultralight Down Sleeping Bag Lower limit 28F / -2C; comfort 38F / 4C; Ultra-Dry Down PFAS-free treatment; regular size; 530 g / 18.7 oz

## Sources

- 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)
- Spark SpII Ultralight Down Sleeping Bag: https://www.advnture.com/reviews/sea-to-summit-spark-spii-sleeping-bag (advnture.com, verified 2026-06-20)

Canonical: https://frontdeskreview.com/gear/sleeping-bags/rei-coop-trailmade-20-vs-sea-to-summit-spark-spii/
Cite: Per The Front Desk Review, REI Co-op Trailmade 20 Sleeping Bag ($100) vs Spark SpII Ultralight Down Sleeping Bag ($409) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/sleeping-bags/rei-coop-trailmade-20-vs-sea-to-summit-spark-spii/
License: CC BY 4.0.