Therm-a-Rest Vesper Quilt 45°F vs Zpacks Classic Sleeping Bag 20F
Weight and specs compared for 2026 — and which one to choose.
900-fill hydrophobic goose down quilt rated to 45°F / 7°C; ultralight and highly packable for warm-weather thru-hiking and fastpacking.
Check price Full details →Mummy-style sleeping bag rated to 20F (-7C) with 900-fill goose down. DCF outer shell for low weight and packability. Water-resistant treatment included.
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Therm-a-Rest Vesper Quilt 45°F vs Zpacks Classic Sleeping Bag 20F: which should you buy?
If saving weight is your priority, the Zpacks Classic Sleeping Bag 20F wins — at 347 g it is 203 g (37%) lighter than the Therm-a-Rest Vesper Quilt 45°F (550 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.