NEMO Equipment
Disco Men's Endless Promise Down Sleeping Bag 15F
$299.95
Released 2024
Best Sleeping Bags · head-to-head
Disco Men's Endless Promise Down Sleeping Bag 15F vs Sidewinder SL 20 Mummy Sleeping Bag
A sourced, side-by-side comparison. Sidewinder SL 20 Mummy Sleeping Bag is cheaper at $199.96. Every spec and price links to its source.
Big Agnes
Sidewinder SL 20 Mummy Sleeping Bag
$199.96Cheaper
Which is better: the Disco Men's Endless Promise Down Sleeping Bag 15F or Sidewinder SL 20 Mummy Sleeping Bag?
The Sidewinder SL 20 Mummy Sleeping Bag wins 1 of the 1 specs we compare head to head; the other wins 0. The Sidewinder SL 20 Mummy Sleeping Bag is the cheaper at $199.96. The Sidewinder SL 20 Mummy Sleeping Bag both leads on specs and costs less — the straightforward pick.
See Disco Men's Endless Promise Down Sleeping Bag 15F on Amazon See Sidewinder SL 20 Mummy 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 | Disco Men's Endless Promise Down Sleeping Bag 15F | Sidewinder SL 20 Mummy Sleeping Bag |
|---|---|---|
| US price | $299.95 | $199.96 |
| Brand | NEMO Equipment | Big Agnes |
| Released | 2024 | — |
| Temperature rating f | 15 | 20 |
| Insulation type | down | down |
| Fill power | 650 | 650 |
| Shape | spoon | mummy |
| Packed weight (lb) | 2.69 | 2.25 |
| Packed size | 11.5 x 8.5 in | 6.5 x 8 in |
| Zipper side | left | center |
| Product note | Classic Spoon shape (mummy variant with extra shoulder/hip width); 650 FP PFAS-free hydrophobic RDS-certified down; Thermo Gill vents | 650-fill DownTek hydrophobic down with body-mapped FireLine ECO synthetic at pressure points; designed for side sleepers; center ambidextrous zipper |
Sources — Disco Men's Endless Promise Down Sleeping Bag 15F: nemoequipment.com (verified 2026-06-20). Sidewinder SL 20 Mummy Sleeping Bag: bigagnes.com (verified 2026-06-20).
What's the difference between the Disco Men's Endless Promise Down Sleeping Bag 15F and Sidewinder SL 20 Mummy Sleeping Bag?
Where the two actually differ on the specs we track (6 of 8). Matching specs are omitted.
- Temperature rating f: Disco Men's Endless Promise Down Sleeping Bag 15F 15 vs Sidewinder SL 20 Mummy Sleeping Bag 20
- Shape: Disco Men's Endless Promise Down Sleeping Bag 15F spoon vs Sidewinder SL 20 Mummy Sleeping Bag mummy
- Packed weight (lb): Disco Men's Endless Promise Down Sleeping Bag 15F 2.69 vs Sidewinder SL 20 Mummy Sleeping Bag 2.25
- Packed size: Disco Men's Endless Promise Down Sleeping Bag 15F 11.5 x 8.5 in vs Sidewinder SL 20 Mummy Sleeping Bag 6.5 x 8 in
- Zipper side: Disco Men's Endless Promise Down Sleeping Bag 15F left vs Sidewinder SL 20 Mummy Sleeping Bag center
- Product note: Disco Men's Endless Promise Down Sleeping Bag 15F Classic Spoon shape (mummy variant with extra shoulder/hip width); 650 FP PFAS-free hydrophobic RDS-certified down; Thermo Gill vents vs Sidewinder SL 20 Mummy Sleeping Bag 650-fill DownTek hydrophobic down with body-mapped FireLine ECO synthetic at pressure points; designed for side sleepers; center ambidextrous zipper