Marmot Hydrogen 30°F vs Marmot Plasma 15°F

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

Marmot Hydrogen 30°F is the lighter option — 141 g lighter than the Marmot Plasma 15°F (17% less weight). If grams matter to you, that is the one to beat.

Spec	Marmot Hydrogen 30°F	Marmot Plasma 15°F
Weight	709 g · 0.709 kg · 1.56 lb	850 g · 0.850 kg · 1.87 lb
Brand	Marmot	Marmot
Category	Sleep System	Sleep System

Marmot Hydrogen 30°F

709 g

Ultralight 800-fill down sleeping bag rated to 30°F.

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Marmot Plasma 15°F

850 g

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

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Marmot Hydrogen 30°F vs Marmot Plasma 15°F: which should you buy?

If saving weight is your priority, the Marmot Hydrogen 30°F wins — at 709 g it is 141 g (17%) lighter than the Marmot Plasma 15°F (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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