Feathered Friends Swallow YF 20°F vs Marmot Hydrogen 30°F

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

Both weigh the same at 709 g, so choose on features, price and fit.

Spec	Feathered Friends Swallow YF 20°F	Marmot Hydrogen 30°F
Weight	709 g · 0.709 kg · 1.56 lb	709 g · 0.709 kg · 1.56 lb
Brand	Feathered Friends	Marmot
Category	Sleep System	Sleep System

Feathered Friends Swallow YF 20°F

709 g

Premium 950-fill down sleeping bag rated to 20°F.

Full details →

Marmot Hydrogen 30°F

709 g

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

Full details →

Feathered Friends Swallow YF 20°F vs Marmot Hydrogen 30°F: which should you buy?

On weight these two are identical (709 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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