REI Co-op
REI Co-op Trailmade 20 Sleeping Bag
$100Cheaper
Best Sleeping Bags · head-to-head
REI Co-op Trailmade 20 Sleeping Bag vs Sea to Summit Spark SpII Ultralight Down Sleeping Bag
A sourced, side-by-side comparison. REI Co-op Trailmade 20 Sleeping Bag is cheaper at $100. Every spec and price links to its source.
Sea to Summit
Sea to Summit Spark SpII Ultralight Down Sleeping Bag
$409
Which is better: the REI Co-op Trailmade 20 Sleeping Bag or Sea to Summit Spark SpII Ultralight Down Sleeping Bag?
The Sea to Summit Spark SpII Ultralight Down Sleeping Bag wins 1 of the 1 specs we compare head to head; the other wins 0. The REI Co-op Trailmade 20 Sleeping Bag is the cheaper at $100. Get the Sea to Summit Spark SpII Ultralight Down Sleeping Bag for the stronger spec sheet, the REI Co-op Trailmade 20 Sleeping Bag to spend less.
See REI Co-op Trailmade 20 Sleeping Bag on Amazon See Sea to Summit Spark SpII Ultralight Down 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 | REI Co-op Trailmade 20 Sleeping Bag | Sea to Summit Spark SpII Ultralight Down Sleeping Bag |
|---|---|---|
| US price | $100 | $409 |
| Brand | REI Co-op | Sea to Summit |
| Released | — | — |
| 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 |
Sources — REI Co-op Trailmade 20 Sleeping Bag: rei.com (verified 2026-06-20). Sea to Summit Spark SpII Ultralight Down Sleeping Bag: advnture.com (verified 2026-06-20).
What's the difference between the REI Co-op Trailmade 20 Sleeping Bag and Sea to Summit Spark SpII Ultralight Down Sleeping Bag?
Where the two actually differ on the specs we track (5 of 8). Matching specs are omitted.
- Temperature rating f: REI Co-op Trailmade 20 Sleeping Bag 21 vs Sea to Summit Spark SpII Ultralight Down Sleeping Bag 28
- Insulation type: REI Co-op Trailmade 20 Sleeping Bag synthetic vs Sea to Summit Spark SpII Ultralight Down Sleeping Bag down
- Packed weight (lb): REI Co-op Trailmade 20 Sleeping Bag 3.29 vs Sea to Summit Spark SpII Ultralight Down Sleeping Bag 1.17
- Packed size: REI Co-op Trailmade 20 Sleeping Bag 10 x 13 in vs Sea to Summit 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 Sea to Summit 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