Nemo Tensor Ultralight vs REI Co-op Magma 15

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

Nemo Tensor Ultralight is the lighter option — 510 g lighter than the REI Co-op Magma 15 (60% less weight). If grams matter to you, that is the one to beat.

Spec	Nemo Tensor Ultralight	REI Co-op Magma 15
Weight	340 g · 0.340 kg · 0.75 lb	850 g · 0.850 kg · 1.87 lb
Brand	Nemo	REI Co-op
Category	Sleep System	Sleep System

Nemo Tensor Ultralight

340 g

Ultralight inflatable pad with minimal noise. R-value 3.5.

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REI Co-op Magma 15

850 g

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

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Nemo Tensor Ultralight vs REI Co-op Magma 15: which should you buy?

If saving weight is your priority, the Nemo Tensor Ultralight wins — at 340 g it is 510 g (60%) 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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