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Feathered Friends Hummingbird UL 30 vs Marmot Plasma 15°F

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

Feathered Friends Hummingbird UL 30 is the lighter option — 317 g lighter than the Marmot Plasma 15°F (37% less weight). If grams matter to you, that is the one to beat.
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Spec Feathered Friends Hummingbird UL 30 Marmot Plasma 15°F
Weight 533 g · 0.533 kg · 1.18 lb 850 g · 0.850 kg · 1.87 lb
Brand Feathered Friends Marmot
Category Sleep System Sleep System
Feathered Friends Hummingbird UL 30
533 g

Premium 30°F ultralight sleeping bag with 900-fill-power goose down. Compact, warm, and durable for multi-season backpacking. (Regular size)

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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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Feathered Friends Hummingbird UL 30 vs Marmot Plasma 15°F: which should you buy?

If saving weight is your priority, the Feathered Friends Hummingbird UL 30 wins — at 533 g it is 317 g (37%) 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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