Best Sleeping Bags · head-to-head
Cosmic Down 20 Sleeping Bag vs Disco Men's Endless Promise Down Sleeping Bag 15F
A sourced, side-by-side spec comparison. Cosmic Down 20 Sleeping Bag is cheaper at $189.95. Every spec and price links to its source.
Side by side
| Cosmic Down 20 Sleeping Bag | Disco Men's Endless Promise Down Sleeping Bag 15F | |
|---|---|---|
| US price | $189.95 (MSRP, regular size, per kelty.com) | $299.95 (MSRP, regular size, per nemoequipment.com) |
| Brand | Kelty | NEMO Equipment |
| Released | 2024 | 2024 |
| temperature rating f | 20 | 15 |
| insulation type | down | down |
| fill power | 550 | 650 |
| shape | semi-rectangular | spoon |
| packed weight lb | 2.44 | 2.69 |
| packed size | 8 x 13 in | 11.5 x 8.5 in |
| zipper side | right | left |
| product note | 550-fill DriDown; ISO comfort 31F, lower limit 21F; regular weight 2 lb 7 oz | Classic Spoon shape (mummy variant with extra shoulder/hip width); 650 FP PFAS-free hydrophobic RDS-certified down; Thermo Gill vents |
Sources — Cosmic Down 20 Sleeping Bag: kelty.com (verified 2026-06-20). Disco Men's Endless Promise Down Sleeping Bag 15F: nemoequipment.com (verified 2026-06-20).