Here is how these two sleeping bags compare on the numbers. They score within a hair of each other, so it comes down to the details below.
| NEMO Riff 30 (Endless Promise) | NEMO Disco 30 | |
|---|---|---|
| GearScore | 82✓ | 81 |
| Comfort rating | 39 °F✓ | 40 °F |
| Weight | 30.0 oz✓ | 31.0 oz |
| Warmth-to-weight | 3.6 /100g✓ | 3.4 /100g |
| Packed size | 4.0 L | 3.7 L✓ |
| Fill power | 800 FP✓ | 650 FP |
| Price | $360 | $280✓ |
| Fill | Down | Down |
| Style | Bag | Bag |
| Shape | Semi-rectangular | Semi-rectangular |
Highlighted cells mark the better spec: Riff 30 (Endless Promise) in blue, Disco 30 in amber. A blank spec is never counted as a win. A lower comfort rating in °F means a warmer bag, so the warmer bag takes that row. GearScore is the overall rating (0 to 100); re-weight it on the full bag comparison. Prices are current MSRP.
The NEMO Riff 30 (Endless Promise) against the NEMO Disco 30 is a study in priorities. They are close enough that this really is about which handful of specs you weight most.
The Riff 30 (Endless Promise) is warmer (rated 39°F vs 40°F), 1 oz lighter, and stronger on warmth-to-weight. The Disco 30 is a touch more packable and $80 cheaper. Their GearScores land within a couple of points (82 vs 81), so neither runs away with it.
Pick the Riff 30 (Endless Promise) if you care most about warmth and low weight, which makes it the better call for colder nights and shoulder-season trips. Pick the Disco 30 if packability and price matter more to you, or you are focused on saving space in your pack.
The NEMO Riff 30 (Endless Promise). It is warmer (rated 39°F vs 40°F) than the Disco 30.
The NEMO Riff 30 (Endless Promise). It is 1 oz lighter than the Disco 30.
They are nearly tied at 82 and 81 on the default algorithm, so re-weight the score to your own priorities to break the tie.
It depends on your priorities. Go with the Riff 30 (Endless Promise) for warmth, or the Disco 30 for packability. The spec table above shows exactly where each wins.