Therm-a-Rest Vesper 20F Quilt vs Zpacks Classic 20°F Sleeping Bag
Weight and specs compared for 2026 — and which one to choose.
Sleeping quilt rated to 20°F (-7°C) filled with 900-fill down, designed for ultralight three-season backpacking. Outstanding warmth-to-weight ratio.
Full details →Ultralight mummy sleeping bag with 900-fill power goose down rated to 20°F. Water-resistant down and Dyneema shell. Weighs 20.3 oz in regular size.
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Therm-a-Rest Vesper 20F Quilt vs Zpacks Classic 20°F Sleeping Bag: which should you buy?
If saving weight is your priority, the Therm-a-Rest Vesper 20F Quilt wins — at 550 g it is 26 g (5%) lighter than the Zpacks Classic 20°F Sleeping Bag (576 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.