REI Co-op Magma 15 Sleeping Bag
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- 850 fill-power goose down insulation
- 15°F (-9°C) temperature rating
- Pertex Quantum ripstop shell fabric
- Water-resistant down treatment
- Full-length YKK zipper with anti-snag draft tube
- Ergonomic hood and contoured footbox
- Internal zippered stash pocket
- Compression stuff sack included
Tech Specs
Pros
- Exceptionally lightweight for a 15°F bag
- Packs down extremely small
- High-quality 850-fill down offers great warmth-to-weight ratio
- Durable yet soft Pertex Quantum shell
- Roomy mummy cut without excess material
Cons
- Premium price point
- Down insulation performs poorly if wet
- Narrow fit may not suit larger sleepers
- Limited color options
The REI Co-op Magma 15 sleeping bag is built for backpackers and thru-hikers who count every ounce without sacrificing warmth on chilly three-season nights. Rated to 15 degrees Fahrenheit, it uses 850-fill-power hydrophobic down that resists moisture and retains loft even when conditions turn damp, so campers get reliable insulation whether they're above treeline or tucked into a humid valley campsite. The mummy-style cut hugs the body to minimize dead air space, while a trapezoidal foot box gives toes room to move naturally instead of being pinned flat, a small design touch that makes a real difference after a long day on the trail. Weight is where the Magma 15 truly shines, tipping the scales at around 1 pound 11 ounces for the regular size, making it one of the lighter options in its temperature class and a favorite among ultralight backpackers trying to trim pack weight without settling for a colder rating. The 15-denier recycled nylon shell and lining are thin but tough enough to handle the abrasion of tent floors and rocky ground, and the fabric's ripstop construction helps prevent small snags from turning into larger tears. A locking zipper draft tube runs the length of the bag to seal in warmth, and an anti-snag design keeps the zipper from catching on the liner during those groggy midnight bathroom trips. Beyond the core specs, the Magma 15 includes thoughtful details like a contoured hood with a drawcord that cinches down around the face for cold nights, plus a stash pocket for a headlamp or phone so essentials stay within reach without leaving the warmth of the bag. It compresses down small, fitting easily into a compression sack for backpacking trips where space is at a premium, and REI backs it with their standard satisfaction guarantee, giving buyers confidence in the investment. Whether it's used for alpine starts on a multi-day trek or as a reliable three-season staple for weekend camping trips, the Magma 15 delivers a rare combination of low weight, packability, and dependable warmth that serious hikers look for in a sleeping bag.
Customer reviews
I used this on a 5-day thru-hike in the Rockies and stayed warm even when temps dropped into the low 20s. The weight savings compared to my old bag is night and day.
Love the warmth-to-weight ratio, but I'm broad-shouldered and found the mummy cut a bit tight. Otherwise, fantastic quality and packs down tiny.
Worth every penny. The down loft is amazing and it compresses to the size of a football. Perfect for long distance trips where every ounce counts.
Performance is excellent, and it's held up well after multiple trips. My only gripe is the cost, but you do get what you pay for with this level of down quality.
