Bantamweight 15 Sleeping Bag vs Disco 15 Sleeping Bag (Endless Promise / latest Disco 15 line)
Head-to-head sleeping bag comparison.
| Bantamweight 15 Sleeping Bag | Disco 15 Sleeping Bag (Endless Promise / latest Disco 15 line) | |
|---|---|---|
| Brand | Marmot | NEMO Equipment |
| Price | $558.95 - $618.95 | $300 - $340 |
| Rating | 4.7 | 4.6 |
The Bottom Line
If absolute weight and packability are your religion, choose the Marmot Bantamweight 15 — it’s the pick for thru-hikers and ultralight backpackers who will baby the bag and accept a snug mummy fit. If you sleep on your side, toss and turn, or expect damp camps and want features that make varied temperatures manageable, go with the NEMO Disco 15 — more roomy, more durable in real conditions, and a much better value for comfort-focused backcountry use.
Warmth & Insulation
Thermally they’re built to the same 15°F target, but they get there differently. Marmot Bantamweight 15 uses 900+ fill-power Down Defender down, which gives far more warmth per ounce (so it hits the rating with much less weight), whereas the NEMO Disco 15 uses 650 FP hydrophobic down that’s heavier but resists moisture better in real use. If you want the best warmth-to-weight ratio, Marmot is the winner; if you’re worried about damp nights or want insulation that holds up when condensation or a wet tent is a realistic risk, NEMO’s hydrophobic treatment is the smarter practical choice.
Weight & Packability
Marmot Bantamweight 15 wins hands-down for weight and stuff size — at about 1 lb 8 oz (Regular) and a 6.3 x 13.8 in packed profile it disappears into a small pack, while the NEMO Disco 15 is a noticeably heavier, bulkier bag (roughly 2 lb 11 oz and ~18 x 9 in packed). On the trail that difference isn’t academic: the Bantamweight frees ounces and cubic inches for a shelter, stove, or extra layers on multi-day treks; the Disco’s bulk is obvious in a tight pack but acceptable if you’re prioritizing sleep comfort over every gram.
Fit, Comfort & Livability
NEMO Disco 15 is the clear winner for comfort and freedom of movement — its spoon/mummy-hybrid shape gives room at elbows and knees, and Thermo Gills let you dump heat without creating a cold draft, making it ideal for side sleepers and restless folks. The Marmot Bantamweight 15 is intentionally slim and thermally efficient, so if you sleep on your back or are ultralight-oriented you’ll appreciate the snug, heat-trapping cut; but broader or restless sleepers will feel restricted in the Bantamweight.
Setup & Convenience Features
NEMO wins feature-wise: the Disco 15 has a full-length, two-way YKK anti-snag zipper (left/right options), Thermo Gills for active ventilation, and a vented footbox — thoughtful details for living in a bag. Marmot’s center-front zipper on the Bantamweight 15 is a useful, uncommon choice that makes entry easier in cramped tents, but it’s a simpler feature set aimed at shaving weight rather than maximizing livability.
Value & Who Should Buy Which
Price makes the choices obvious: the NEMO Disco 15 sits in the $300–$340 range and offers a lot of comfort and practical features per dollar, while the Marmot Bantamweight 15 commands $559–$619 because you’re paying for elite 900+ loft and minimal weight. Buy the Marmot if you’re an experienced ultralighter who truly counts grams and values a tiny pack profile; buy the NEMO if you want a more forgiving, comfortable 3-season bag that handles real-world dampness and movement without breaking the bank.
Weather Protection & Durability
NEMO takes the lead here for real-world durability and wet-weather behavior: the Disco’s 30D shell (with a 40D waterproof/breathable footbox) and hydrophobic 650 down will tolerate damp camps and abrasion better than the Bantamweight’s ultralight nylon ripstop and untreated-but-Down-Defender-treated 900+ down. Marmot’s Down Defender gives the Bantamweight a helpful edge over plain down, but ultralight fabrics and high-loft down are still more vulnerable to snagging and saturation — expect more careful handling and faster loss of loft if you regularly camp in wet conditions.
Read full Bantamweight 15 Sleeping Bag review · Read full Disco 15 Sleeping Bag (Endless Promise / latest Disco 15 line) review