NEMO Equipment
Disco Men's Endless Promise Down Sleeping Bag 15F
$299.95Cheaper
Released 2024
Best Sleeping Bags · head-to-head
Disco Men's Endless Promise Down Sleeping Bag 15F vs UltraLite Sleeping Bag
A sourced, side-by-side comparison. Disco Men's Endless Promise Down Sleeping Bag 15F is cheaper at $299.95. Every spec and price links to its source.
Western Mountaineering
UltraLite Sleeping Bag
$660
Which is better: the Disco Men's Endless Promise Down Sleeping Bag 15F or UltraLite Sleeping Bag?
The UltraLite Sleeping Bag wins 1 of the 1 specs we compare head to head; the other wins 0. The Disco Men's Endless Promise Down Sleeping Bag 15F is the cheaper at $299.95. Get the UltraLite Sleeping Bag for the stronger spec sheet, the Disco Men's Endless Promise Down Sleeping Bag 15F to spend less.
See Disco Men's Endless Promise Down Sleeping Bag 15F on Amazon See UltraLite 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 | UltraLite Sleeping Bag |
|---|---|---|
| US price | $299.95 | $660 |
| Brand | NEMO Equipment | Western Mountaineering |
| Released | 2024 | — |
| Temperature rating f | 15 | 20 |
| Insulation type | down | down |
| Fill power | 650 | 850 |
| Shape | spoon | mummy |
| Packed weight (lb) | 2.69 | 1.81 |
| Packed size | 11.5 x 8.5 in | 7 x 13 in |
| Zipper side | left | left or right |
| Product note | Classic Spoon shape (mummy variant with extra shoulder/hip width); 650 FP PFAS-free hydrophobic RDS-certified down; Thermo Gill vents | 850+ FP ethically-sourced premium goose down; USA made; full-length #5 YKK zipper; 6'0" version weighs 1 lb 13 oz |
Sources — Disco Men's Endless Promise Down Sleeping Bag 15F: nemoequipment.com (verified 2026-06-20). UltraLite Sleeping Bag: westernmountaineering.com (verified 2026-06-20).
What's the difference between the Disco Men's Endless Promise Down Sleeping Bag 15F and UltraLite Sleeping Bag?
Where the two actually differ on the specs we track (7 of 8). Matching specs are omitted.
- Temperature rating f: Disco Men's Endless Promise Down Sleeping Bag 15F 15 vs UltraLite Sleeping Bag 20
- Fill power: Disco Men's Endless Promise Down Sleeping Bag 15F 650 vs UltraLite Sleeping Bag 850
- Shape: Disco Men's Endless Promise Down Sleeping Bag 15F spoon vs UltraLite Sleeping Bag mummy
- Packed weight (lb): Disco Men's Endless Promise Down Sleeping Bag 15F 2.69 vs UltraLite Sleeping Bag 1.81
- Packed size: Disco Men's Endless Promise Down Sleeping Bag 15F 11.5 x 8.5 in vs UltraLite Sleeping Bag 7 x 13 in
- Zipper side: Disco Men's Endless Promise Down Sleeping Bag 15F left vs UltraLite Sleeping Bag left or right
- 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 UltraLite Sleeping Bag 850+ FP ethically-sourced premium goose down; USA made; full-length #5 YKK zipper; 6'0" version weighs 1 lb 13 oz