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Feathered Friends Hummingbird UL 30 Sleeping Bag vs Therm-a-Rest Vesper 32

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

Therm-a-Rest Vesper 32 is the lighter option — 18 g lighter than the Feathered Friends Hummingbird UL 30 Sleeping Bag (3% less weight). If grams matter to you, that is the one to beat.
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Spec Feathered Friends Hummingbird UL 30 Sleeping Bag Therm-a-Rest Vesper 32
Weight 568 g · 0.568 kg · 1.25 lb 550 g · 0.550 kg · 1.21 lb
Brand Feathered Friends Therm-a-Rest
Category Sleep System Sleep System
Feathered Friends Hummingbird UL 30 Sleeping Bag
568 g

Premium 30°F sleeping bag loaded with 900-fill goose down, ultralight mummy construction ideal for three-season alpine and trail use.

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Therm-a-Rest Vesper 32
550 g

Ultralight 32°F sleeping bag with 900-fill-power hydrophobic goose down. Excellent warmth-to-weight ratio for 3-season backpacking.

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Feathered Friends Hummingbird UL 30 Sleeping Bag vs Therm-a-Rest Vesper 32: which should you buy?

If saving weight is your priority, the Therm-a-Rest Vesper 32 wins — at 550 g it is 18 g (3%) lighter than the Feathered Friends Hummingbird UL 30 Sleeping Bag (568 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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