Disco 15 Sleeping Bag (Endless Promise / latest Disco 15 line) vs REI Magma 15
Head-to-head sleeping bag comparison.
| Disco 15 Sleeping Bag (Endless Promise / latest Disco 15 line) | REI Magma 15 | |
|---|---|---|
| Brand | NEMO Equipment | REI Co-op |
| Price | $300 - $340 | $369 - $429 |
| Rating | 4.6 | 4.6 |
Comfort & Fit
NEMO Disco 15 wins outright for comfort — its spoon/mummy hybrid gives real elbow and knee room that side sleepers and restless movers will notice immediately, while the REI Magma 15’s traditional mummy cut is slimmer and can feel restrictive to anyone who likes to shift at night. That said, Magma makes gains with expanded sizing and careful baffle design, so if you want a snug, heat-efficient bag and accept a tighter fit it's the better weight-conscious choice. Bottom line: choose Disco for livability and sleep quality, choose Magma if you prioritize a close, thermally efficient fit.
The Bottom Line
If your priority is shaving ounces and maximizing warmth-per-pound for long miles, get the REI Co-op Magma 15 — it’s the clear winner for backpackers who value compressibility, premium 850-fill down, and technical anti-heat-loss details. If you sleep on your side, move around a lot in your sleep, or want a more durable, forgiving bag with superior venting and room, buy the NEMO Disco 15 — it sacrifices weight for real-world comfort that you’ll appreciate night after night. Don’t be seduced by the shared “15°F” label: Magma is the pick for ultralight warmth efficiency; Disco is the pick for comfort-first three-season camping.
Features & Usability
Features are where the philosophies diverge: the Disco 15 focuses on livability with Thermo Gills, a vented footbox, and a roomy spoon shape geared toward temperature flexibility and movement, while the Magma 15 packs technical weight-saving features like a draft collar, zipper draft tube, variable baffles and a vaulted footbox to retain heat more efficiently. For straightforward on-trail usability and technical cold retention per ounce, Magma wins — it gives you premium, efficient details in a lightweight package — but for real-world comfort control and tossing-and-turning usability the Disco’s vents and roomy cut are unmatched. In short, Magma is the technical toolkit; Disco is the sleep comfort toolkit.
Weight & Packability
The REI Co-op Magma 15 handily wins on weight and pack size — a men’s regular tips the scale around 1 lb 12 oz and shrinks to roughly a 5.2 L stuffed volume, while the NEMO Disco 15 lives in a different class at roughly 2 lb 11 oz to 3 lb 10 oz with a much larger, bulkier sack. On the trail that difference is concrete: the Magma clears space and lightens shoulder-season packs, while the Disco’s spoon shape and heavier fabrics make it more cumbersome to cram into an already-full pack. If you care about ounces or compressibility for long miles, Magma is the clear pick; if you tolerate extra bulk for night-time comfort, Disco accepts the weight trade-off.
Value & Who Should Buy Which
Price-wise the Disco 15 sits around $300–$340 and trades weight for livability and durability; the Magma 15 runs higher (mid-$300s to $429) but delivers an 850-fill, ultralight experience that’s hard to match at that price. If you’re a thru-hiker or weight-obsessed weekend trekker who wants the best warmth-to-weight and compressibility for the money, pay for the Magma — it’s worth the premium. If you’re a side sleeper, car-camper, or weekend backpacker who prioritizes roomy comfort, draft control, and a tougher shell, the Disco is the smarter buy despite the extra bulk.
Materials, Durability & Construction
REI went ultra-light with the Magma 15 — 15D Pertex Quantum shell and 850-fill goose down make for excellent compressibility but a fabric that’s more vulnerable to abrasion; NEMO built the Disco 15 from tougher 30D nylon ripstop (plus a 40D waterproof/breathable footbox), so the Disco is the more hard-wearing, camp-duty bag. If you habitually sleep on rough ground, toss a tarp under your pad, or leave a bag stuffed in a pack all day, the Disco tolerates abuse better; if you baby your sleep system and want the lightest material possible, the Magma rewards that care with major weight savings. Both use RDS sourcing, but Magma’s lighter fabrics demand a little more attention in the field.
Warmth, Insulation & Temperature Management
On paper both list a 15°F lower-limit, but they get there differently: the Magma 15 uses 850-fill goose down for a superior warmth-to-weight ratio, whereas the Disco 15 uses 650-fill hydrophobic down and relies on design tricks like Thermo Gills and a vented footbox to manage comfort across temperature swings. Practically, Magma will keep you warmer for less down weight (better for cold-by-weight metrics), but Disco gives you more usable temperature control overnight — you can dump heat through the gills without letting in drafts. Winner depends on your priority: Magma for raw warmth-per-ounce, Disco for on-the-ground temperature regulation and versatility.
Read full Disco 15 Sleeping Bag (Endless Promise / latest Disco 15 line) review · Read full REI Magma 15 review