REI Co-op Magma Sleeping Bag
Best lightweight warmth for budget conscious backpackers.
Designed for cold-weather backpacking, this mummy-style bag balances high-loft insulation with a lightweight build. It offers a snug, heat-trapping fit that excels in alpine environments, making it a reliable choice for those who prioritize warmth-to-weight efficiency on the trail.
$193.05
More Magma options
Who it's for
- Ounce-counting backpackers seeking reliable warmth on high-altitude treks
- Long-distance hikers prioritizing a streamlined and compact gear setup
- Side sleepers and active movers who need a natural fit
Who should skip it
- Rough-and-tumble campers who prioritize gear durability over weight savings
- Larger-framed sleepers or individuals who feel claustrophobic in tight bags
- Budget-conscious weekenders who only camp in mild summer conditions
Performance breakdown
Warmth-to-Weight Ratio
High-loft down delivers serious thermal efficiency without the typical bulk.
Packability
Compresses down to a compact 10 liters for effortless pack integration.
Thermal Regulation
Contoured hood and insulated yoke effectively lock in heat during freezes.
Footbox Comfort
Trapezoidal shape allows natural foot splay without creating cold spots.
Shoulder Room
Snug mummy cut prioritizes heat retention over expansive interior space.
Sustainability
Responsible Down Standard certification ensures ethical sourcing throughout the supply chain.
Key Specs
Temperature Rating
15 degrees Fahrenheit
ISO Comfort Rating
21 degrees Fahrenheit
ISO Lower Limit Rating
9 degrees Fahrenheit
Insulation Type
850-fill-power goose down
Sleeping Bag Shape
Mummy
Lining Material
Nylon
Shoulder Girth
62.5 inches
Hip Girth
54 inches
Compressed Volume
10 liters
Know before you buy
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Ask Metto anything about the REI Co-op Magma Sleeping Bag before you decide.
