# Disco Men's Endless Promise Down Sleeping Bag 15F vs Spark SpII Ultralight Down Sleeping Bag: specs and price compared

A sourced, side-by-side comparison of the Disco Men's Endless Promise Down Sleeping Bag 15F (NEMO Equipment) and Spark SpII Ultralight Down Sleeping Bag (Sea to Summit) among sleeping bags. Disco Men's Endless Promise Down Sleeping Bag 15F is the cheaper of the two at $299.95.

## Side by side

| Spec | Disco Men's Endless Promise Down Sleeping Bag 15F | Spark SpII Ultralight Down Sleeping Bag |
| --- | --- | --- |
| US price | $299.95 | $409 |
| Brand | NEMO Equipment | Sea to Summit |
| Released | 2024 | — |
| Temperature rating f | 15 | 28 |
| Insulation type | down | down |
| Fill power | 650 | 850 |
| Shape | spoon | mummy |
| Packed weight (lb) | 2.69 | 1.17 |
| Packed size | 11.5 x 8.5 in | 2.5 L (approx. 1-liter bottle size) |
| Zipper side | left | — |
| Product note | Classic Spoon shape (mummy variant with extra shoulder/hip width); 650 FP PFAS-free hydrophobic RDS-certified down; Thermo Gill vents | 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: Disco Men's Endless Promise Down Sleeping Bag 15F 15 vs Spark SpII Ultralight Down Sleeping Bag 28
- Fill power: Disco Men's Endless Promise Down Sleeping Bag 15F 650 vs Spark SpII Ultralight Down Sleeping Bag 850
- Shape: Disco Men's Endless Promise Down Sleeping Bag 15F spoon vs Spark SpII Ultralight Down Sleeping Bag mummy
- Packed weight (lb): Disco Men's Endless Promise Down Sleeping Bag 15F 2.69 vs Spark SpII Ultralight Down Sleeping Bag 1.17
- Packed size: Disco Men's Endless Promise Down Sleeping Bag 15F 11.5 x 8.5 in vs Spark SpII Ultralight Down Sleeping Bag 2.5 L (approx. 1-liter bottle size)
- 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 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

- Disco Men's Endless Promise Down Sleeping Bag 15F: https://www.nemoequipment.com/products/disco-mens-endless-promise-down-sleeping-bag (nemoequipment.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/nemo-disco-15-endless-promise-vs-sea-to-summit-spark-spii/
Cite: Per The Front Desk Review, Disco Men's Endless Promise Down Sleeping Bag 15F ($299.95) vs Spark SpII Ultralight Down Sleeping Bag ($409) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/sleeping-bags/nemo-disco-15-endless-promise-vs-sea-to-summit-spark-spii/
License: CC BY 4.0.