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Feathered Friends Hummingbird YF 30°F vs Marmot Hydrogen 30°F

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

Feathered Friends Hummingbird YF 30°F is the lighter option — 199 g lighter than the Marmot Hydrogen 30°F (28% less weight). If grams matter to you, that is the one to beat.
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Spec Feathered Friends Hummingbird YF 30°F Marmot Hydrogen 30°F
Weight 510 g · 0.510 kg · 1.12 lb 709 g · 0.709 kg · 1.56 lb
Brand Feathered Friends Marmot
Category Sleep System Sleep System
Feathered Friends Hummingbird YF 30°F
510 g

Ultralight 950-fill down bag rated to 30°F (-1°C).

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Marmot Hydrogen 30°F
709 g

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

Full details →

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Feathered Friends Hummingbird YF 30°F vs Marmot Hydrogen 30°F: which should you buy?

If saving weight is your priority, the Feathered Friends Hummingbird YF 30°F wins — at 510 g it is 199 g (28%) 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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