REI Co-op Magma 15 Sleeping Bag vs NEMO Disco Men's Endless Promise Down Sleeping Bag

Editorial Team
Last modified at May 23, 2026
When it comes to backpacking sleeping bags, the REI Co-op Magma 15 and NEMO Disco Men's Endless Promise Down are two top contenders. Both offer excellent warmth and packability, but they have distinct differences that cater to different needs. The REI Co-op Magma 15 is exceptionally lightweight and packable, making it ideal for long trips where space and weight are critical. On the other hand, the NEMO Disco Men's Endless Promise Down excels in comfort and durability, with a roomy design and robust materials.

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REI Co-op Magma 15 Sleeping BagNEMO Disco Men's Endless Promise Down Sleeping Bag
REI Co-op Magma 15 Sleeping Bag
Disco Men's Endless Promise Down Sleeping Bag
Weight

Short: 33.9 oz Short Wide: 38.8 oz Medium: 39.2 oz Medium Wide: 40 oz Long: 40.5 oz Long Wide: 44.5 oz

15°F / Regular: 43 oz 15°F / Regular Wide: 45 oz 15°F / Long: 49 oz 15°F / Long Wide: 51 oz 30°F / Regular: 31 oz 30°F / Regular Wide: 33 oz 30°F / Long: 34 oz 30°F / Long Wide: 35 oz

Fill Power

850

650

Packed Size

Short: 397 cu in Medium: 488 cu in Long: 499 cu in

15°F Regular: 11.5 x 8.5 in dia / 29 x 21 cm; compressed volume 6.7 L

Shell Material

Recycled nylon

100% recycled PET

Fits Up To Height

Short: 65 in Short Wide: 65 in Medium: 71 in Medium Wide: 71 in Long: 77 in Long Wide: 77 in

15°F / Regular: 78 in 15°F / Regular Wide: 78 in 15°F / Long: 90 in 15°F / Long Wide: 90 in 30°F / Regular: 78 in 30°F / Regular Wide: 78 in 30°F / Long: 90 in 30°F / Long Wide: 90 in

Warranty

1 Year

NEMO Adventure Forever Guarantee™

Zipper Type

Left-hand, anti-snag

Anti-snag

Down Treatment

Water-resistant

Hydrophobic, PFAS-free, RDS-certified

Baffle Construction

Variable baffle spacing

Vertical along torso, horizontal below waist

Foot Box Shape

Trapezoidal

3D

Hood Type

Comfort-focused

Insulated, reinforced with PFAS-free waterproofing

Water Resistance

DWR finish

PFAS-free waterproofing on hood and footbox

Draft Collar

Insulated yoke

Blanket Fold™

Temperature Rating

15°F

15°F / 16°F ISO Limit

Comfort

REI Co-op Magma 15 Sleeping Bag

4.6/ 5.0

Disco Men's Endless Promise Down Sleeping Bag

4.8/ 5.0

Comfort is crucial for a good night's sleep during backpacking trips. A comfortable sleeping bag ensures you wake up refreshed and ready for the day's adventures. The NEMO Disco Men's Endless Promise Down stands out with its roomy spoon shape, offering extra space at the elbows and knees, which is particularly beneficial for side sleepers. Buyers praise its relaxed shape and freedom to move, making it feel more like a cozy bed. The REI Co-op Magma 15 also provides a comfortable experience with a roomy foot box and natural arm position, but it doesn't quite match the luxurious feel of the NEMO bag. For those who prioritize comfort, especially side sleepers, the NEMO Disco Men's Endless Promise Down is the clear winner.

Warmth

REI Co-op Magma 15 Sleeping Bag

4.2/ 5.0

Disco Men's Endless Promise Down Sleeping Bag

4.9/ 5.0

Warmth is a key factor for backpacking sleeping bags, especially in cold conditions. The NEMO Disco Men's Endless Promise Down excels with its 650-fill water-resistant down and Thermo Gill vents, which regulate heat retention effectively. Buyers report that it keeps them toasty in cold weather while allowing easy heat regulation. The REI Co-op Magma 15 also provides excellent warmth with its 850-fill power down, but it has a few complaints about cold spots. The NEMO bag's consistent warmth and advanced features make it the better choice for those who need reliable insulation in varying temperatures.

Durability

REI Co-op Magma 15 Sleeping Bag

3.3/ 5.0

Disco Men's Endless Promise Down Sleeping Bag

4.7/ 5.0

Durability ensures your sleeping bag can withstand the rigors of backpacking trips. The NEMO Disco Men's Endless Promise Down is made with 100% recycled polyester ripstop fabric and DWR coating, making it resistant to snags, tears, and light moisture. Buyers appreciate its robust construction and hydrophobic treated down, which performs well even when wet. The REI Co-op Magma 15, while lightweight, has some concerns about the durability of its materials and requires careful handling to avoid damage. For those who need a durable sleeping bag that can handle rough conditions, the NEMO Disco Men's Endless Promise Down is the superior choice.

Packability

REI Co-op Magma 15 Sleeping Bag

4.7/ 5.0

Disco Men's Endless Promise Down Sleeping Bag

4.4/ 5.0

Packability is essential for backpackers who need to save space and weight. The REI Co-op Magma 15 is exceptionally lightweight and packable, with buyers praising its compact size and ability to pack down to the size of two Nalgene bottles. It's one of the lightest bags available, making it ideal for long trips where space is at a premium. The NEMO Disco Men's Endless Promise Down is also lightweight and compressible, but some buyers find it slightly bulkier than ultralight options. For those who prioritize packability, the REI Co-op Magma 15 is the clear winner.

Versatility

REI Co-op Magma 15 Sleeping Bag

3.9/ 5.0

Disco Men's Endless Promise Down Sleeping Bag

4.8/ 5.0

Versatility allows a sleeping bag to adapt to different weather conditions and uses. The NEMO Disco Men's Endless Promise Down shines with its Thermo Gill vents and multi-stage zipper system, which let you adapt to warmer or colder temperatures. Buyers appreciate its ability to be used in various conditions, from summer to winter, making it a great all-around bag. The REI Co-op Magma 15 is also versatile, with positive feedback for all-season use, but it doesn't offer the same level of adaptability as the NEMO bag. For those who need a versatile sleeping bag that can handle a range of temperatures, the NEMO Disco Men's Endless Promise Down is the better choice.

Ease Of Use

REI Co-op Magma 15 Sleeping Bag

4.1/ 5.0

Disco Men's Endless Promise Down Sleeping Bag

4.6/ 5.0

Ease of use can make a significant difference in your backpacking experience. The NEMO Disco Men's Endless Promise Down features an anti-snag zipper and blanket-fold draft collar, making it easy to adjust and snuggle in. Buyers appreciate its multiple pockets and full-length zip, which add to its convenience. The REI Co-op Magma 15 has a functional zipper, but it can be finicky and may snag if not handled gently. For those who value ease of use and convenience, the NEMO Disco Men's Endless Promise Down is the clear winner.

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Conclusion & Final Verdict:

After comparing the REI Co-op Magma 15 and NEMO Disco Men's Endless Promise Down sleeping bags, it's clear that each has its strengths. The REI Co-op Magma 15 is the better choice for those who prioritize lightweight and packability, making it ideal for long backpacking trips where space and weight are critical. On the other hand, the NEMO Disco Men's Endless Promise Down excels in comfort, warmth, durability, versatility, and ease of use, making it a great all-around option for various conditions. If you need a lightweight and compact sleeping bag, go with the REI Co-op Magma 15. If you prefer a comfortable, durable, and versatile sleeping bag, the NEMO Disco Men's Endless Promise Down is the way to go.

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