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Marmot Hydrogen 30°F vs Western Mountaineering Ultralite 20°F

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

Western Mountaineering Ultralite 20°F is the lighter option — 29 g lighter than the Marmot Hydrogen 30°F (4% less weight). If grams matter to you, that is the one to beat.
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Spec Marmot Hydrogen 30°F Western Mountaineering Ultralite 20°F
Weight 709 g · 0.709 kg · 1.56 lb 680 g · 0.680 kg · 1.50 lb
Brand Marmot Western Mountaineering
Category Sleep System Sleep System
Marmot Hydrogen 30°F
709 g

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

Full details →
Western Mountaineering Ultralite 20°F
680 g

Premium 850-fill down sleeping bag rated to 20°F (-7°C).

Full details →

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Marmot Hydrogen 30°F vs Western Mountaineering Ultralite 20°F: which should you buy?

If saving weight is your priority, the Western Mountaineering Ultralite 20°F wins — at 680 g it is 29 g (4%) lighter than the Marmot Hydrogen 30°F (709 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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