Both of these bags are designed for restless sleepers who hate being mummified at night. NEMO's Disco uses a spoon shape that gives your shoulders and elbows room to move; the Therm-a-Rest Saros 32 goes further with a blanket fold and foot box designed for active sleepers. They're aimed at the same person but take different approaches.
NEMO Disco 15
The NEMO Disco 15 is warmer and better for backpacking; the Saros 32 is more comfortable for side sleepers in milder conditions.
Specs Comparison
| Spec | NEMO Disco 15 | Therm-a-Rest Saros 32 |
|---|---|---|
| MSRP | ~$230 | ~$200 |
| Weight | 2 lbs 8 oz | 2 lbs 12 oz |
| Temp Rating | 15°F / -9°C | 32°F / 0°C |
| Insulation | 650-fill DownTek down | PrimaLoft synthetic |
| Shape | Spoon mummy | Blanket fold |
| Packed Size | Smaller | Slightly larger |
Shape and Comfort
NEMO's spoon shape widens at the elbows and shoulders — you can cross your arms across your chest or sleep on your side without the bag fighting you. The Saros 32 uses a blanket fold at the top that lets you kick a foot out without unzipping.
Side sleepers in r/Ultralight consistently rate the Disco as one of the most comfortable mummy-style bags for that sleeping style.
Temperature Ratings and Warmth
The Disco 15 is EN-rated to 15°F for men, with a comfort rating near 22°F. The Saros 32 is rated to 32°F — a significant warmth gap.
If you camp in shoulder season or at altitude, the Disco's warmer rating is a meaningful safety margin. The Saros is a three-season bag best suited to summer.
Insulation and Fill
The Disco 15 uses 650-fill DownTek water-resistant down throughout. The Saros 32 uses PrimaLoft synthetic, which handles moisture better but weighs more per unit of warmth.
For dry climates, the Disco's down is the better performer. In the Pacific Northwest or on shoulder-season trips with wet conditions, the Saros's synthetic may edge ahead.
Weight and Price
The Disco 15 weighs about 2 lbs 8 oz; the Saros 32 is around 2 lbs 12 oz. Prices are similar at roughly $200–$250 depending on sales.
For most backpackers, the Disco is the better all-around choice. The Saros earns its place for warm-weather car camping and as a second bag for guests.
NEMO Disco 15 Strengths
- Warmer at 15°F EN-rated vs Saros 32's 32°F rating
- DownTek water-resistant down is light and compressible
- Spoon shape fits side sleepers without restriction
Therm-a-Rest Saros 32 Strengths
- Blanket fold lets you kick a foot out or vent without unzipping
- Synthetic fill performs better in damp conditions
- Good for mild-weather camping where warmth isn't critical
NEMO Disco 15 Weaknesses
- Down loses insulation when wet — a concern in very humid conditions
- Slightly pricier than comparable synthetic bags
Therm-a-Rest Saros 32 Weaknesses
- Only rated to 32°F — not suitable for cold shoulder-season camping
- Heavier than down alternatives at the same warmth level
- Compresses less than down for the same volume
Best For
- a: Three-season backpackers and side sleepers who camp in cold or varied conditions
- b: Warm-weather campers who want maximum vent-ability and moisture resistance
FAQ
Is DownTek actually water-resistant enough to matter?
It helps in light moisture and condensation scenarios, but it's not a substitute for keeping your bag dry in a stuff sack on a wet trip.
Which bag is easier to get into at 2am when half-asleep?
The Saros 32's blanket fold makes entry easier — you can practically just lie down on it. The Disco requires threading yourself in like a standard mummy.
Are these bags suitable for taller people?
Both are available in regular and long versions. The Disco 15 Long fits up to 6'6"; the Saros 32 Long fits up to 6'6" as well.