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REI Co-op Magma 15 vs Zenbivy Ultralight Bed

Weight and specs compared for 2026 — and which one to choose.

Zenbivy Ultralight Bed is the lighter option — 283 g lighter than the REI Co-op Magma 15 (33% less weight). If grams matter to you, that is the one to beat.
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Spec REI Co-op Magma 15 Zenbivy Ultralight Bed
Weight 850 g · 0.850 kg · 1.87 lb 567 g · 0.567 kg · 1.25 lb
Brand REI Co-op Zenbivy
Category Sleep System Sleep System
REI Co-op Magma 15
850 g

850-fill down sleeping bag rated to 15°F. Great value.

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Zenbivy Ultralight Bed
567 g

Hybrid sleep system: a 482g down quilt plus an 85g fitted sheet that attaches to a sleeping pad for a traditional, draft-free bed-like sleeping experience.

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REI Co-op Magma 15 vs Zenbivy Ultralight Bed: which should you buy?

If saving weight is your priority, the Zenbivy Ultralight Bed wins — at 567 g it is 283 g (33%) lighter than the REI Co-op Magma 15 (850 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.

See where both rank against everything else in this category on the lightest sleep system page, or browse the full gear weight database.

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