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The REI Co-op Magma 30 is a three-season mummy bag filled with water-resistant 850-fill down, rated to a 30°F comfort point and a 24°F ISO lower limit. It packs small for backpacking and weighs little for a down bag at this price. The long-wide version adds length and shoulder room for bigger sleepers. At $250.93 at REI as of November 5, 2026, it sits near the top of its recent range, so waiting for a Co-op sale or member coupon is reasonable.
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Lowest price we've seen: $250.93 on Nov 5 at REI. Tracked across 1 store since Nov 5.
Ratings average 3.7 out of 5 from 47 buyers, with most praise for warmth-to-weight and packability. Complaints center on the temperature rating running cold for some sleepers and on durability of the thin shell.