Feathered Friends Hummingbird UL 30 Sleeping Bag vs Therm-a-Rest Vesper 900
Weight and specs compared for 2026 — and which one to choose.
Premium 30°F sleeping bag loaded with 900-fill goose down, ultralight mummy construction ideal for three-season alpine and trail use.
Ultralight sleeping bag with 900 fill-power hydrophobic goose down. 360g of down fill. Excellent warmth-to-weight ratio for three-season backpacking trips.
Building a pack? Add either one to your HikeLoad list, or drop its weight into the base weight calculator, and see what it does to your total weight.
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Feathered Friends Hummingbird UL 30 Sleeping Bag vs Therm-a-Rest Vesper 900: which should you buy?
If saving weight is your priority, the Therm-a-Rest Vesper 900 wins — at 550 g it is 51 g (8%) lighter than the Feathered Friends Hummingbird UL 30 Sleeping Bag (601 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.