Bantamweight 15 Sleeping Bag vs Riff 15 Endless Promise
Head-to-head sleeping bag comparison.
| Bantamweight 15 Sleeping Bag | Riff 15 Endless Promise | |
|---|---|---|
| Brand | Marmot | NEMO Equipment |
| Price | $558.95 - $618.95 | $399 - $450 |
| Rating | 4.7 | 4.4 |
Fit & Comfort
NEMO Riff 15 is the clear winner for comfort — its Spoon-shaped hybrid cut gives extra elbow and knee room that side sleepers and restless campers will appreciate. The Marmot Bantamweight 15 is deliberately slim and thermally efficient, but that mummy trim will feel restrictive if you toss and turn or sleep on your side. If sleep quality matters more than shaving ounces, pick the Riff; if you routinely sleep on your back and prioritize thermal efficiency, the Bantamweight’s snug fit is a defensible trade.
The Bottom Line
Pick the Marmot Bantamweight 15 if you’re an ultralight-focused backpacker who counts grams, sleeps mostly on your back, and needs the best warmth-to-weight and smallest stuff size — it’s the winner when every ounce matters. Choose the NEMO Riff 15 if you sleep on your side, overheat, or prioritize a roomier bag with real-world features like Thermo Gills, a robust shell, and a lower price — it’s the winner for comfortable shoulder-season use and everyday backcountry reliability. Don’t buy the Marmot for comfort-first camping; don’t buy the Riff if you’re trying to minimize pack weight above all else.
Warmth & Insulation
If you judge by warmth-per-ounce the Marmot Bantamweight 15 wins — its 900+ fill-power down delivers more loft and insulation for every gram of fill than the NEMO Riff 15’s 800-fill down. Practically speaking that means the Marmot will feel warmer for its weight on cold nights, while the Riff reaches the same 15°F rating with more bulk. That said, NEMO’s Thermo Gills and a slightly roomier cut make the Riff a more breathable, user-friendly bag for shoulder-season nights when you’re likely to overheat or need venting — so Marmot wins the raw efficiency battle, NEMO wins real-world temperature control.
Features & Usability
NEMO Riff 15 wins on practical features — its full-length side zipper with two-way operation, Thermo Gills for controlled venting, and draft-collar/footbox details give you more ways to manage comfort and heat on the trail. The Marmot Bantamweight 15’s center/front zip is a thoughtful nod to access in small tent interiors and trims weight, but it’s still a simpler, more minimalist feature set. If you value fiddly but useful creature comforts and ventilation, the Riff is better; if you want a stripped-down, lighter bag with easier entry, the Bantamweight is the pick.
Weight & Packability
Marmot Bantamweight 15 wins here — at about 1 lb 8.3 oz (Regular) and a stuff size around 6.3 x 13.8 in it’s class-leading for a 15°F bag. The NEMO Riff 15 trades that small footprint for comfort, tipping the scales closer to 2 lb 6 oz (and up depending on model) with a slightly larger packed size (around 6.9 L / 9.5 in compressed). On multi-day, weight-conscious trips the Marmot saves noticeable ounces and pack space; if you’re not shaving grams, the Riff’s extra volume is the cost of sleeping roomier.
Value & Who Should Buy Which
The NEMO Riff 15 is the better value for most backpackers — priced around $399–$450 it gives roomy comfort, useful temp-management features, and tougher fabrics for less cash than the Marmot Bantamweight 15’s $559–$619 price. The Marmot is worth the premium only if you’re an experienced ultralight hiker who truly needs the extra loft-per-ounce and smaller stuff size. Bottom line: spend on the Marmot only if grams and pack space are your highest priorities; buy the NEMO if you want comfort, venting, and better bang-for-your-buck.
Materials & Weather Resistance
NEMO Riff 15 takes this category — its heavier 20D ripstop shell, 30D nylon taffeta lining with DWR, a water-resistant footbox, and responsibly sourced 800-fill down give it better all-around damp performance and durability than the ultralight Marmot Bantamweight 15. Marmot fights back with 900+ Down Defender-treated down that resists moisture better than untreated down, but the Bantamweight’s ultralight 100% nylon ripstop shell and thinner fabrics make it less hard-bodied in wet, rough use. In short: Marmot protects loft with treated down and wins for weight, NEMO wins for robust fabrics and realistic moisture resistance in the field.
Read full Bantamweight 15 Sleeping Bag review · Read full Riff 15 Endless Promise review