Marmot Plasma 15°F vs REI Co-op Magma 15

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

Both weigh the same at 850 g, so choose on features, price and fit.

Spec	Marmot Plasma 15°F	REI Co-op Magma 15
Weight	850 g · 0.850 kg · 1.87 lb	850 g · 0.850 kg · 1.87 lb
Brand	Marmot	REI Co-op
Category	Sleep System	Sleep System

Marmot Plasma 15°F

850 g

800-fill down sleeping bag rated to 15°F (-9°C).

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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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Marmot Plasma 15°F vs REI Co-op Magma 15: which should you buy?

On weight these two are identical (850 g), so your decision comes down to features, fit and price. Check the full details and current price for each above.

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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