Sea to Summit Spark Pro Down 30 vs Therm-a-Rest Vesper 32 Quilt
Weight and specs compared for 2026 — and which one to choose.
Ultralight mummy bag rated to 30F (-1C) with 950+ fill-power Ultra-Dry Down. 10-denier shell, shoulder and footbox zippers for temperature control.
Full details →900-fill hydrophobic down quilt with cinchable footbox. Top-rated ultralight quilt for 3-season backpacking with excellent warmth-to-weight ratio.
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Sea to Summit Spark Pro Down 30 vs Therm-a-Rest Vesper 32 Quilt: which should you buy?
If saving weight is your priority, the Therm-a-Rest Vesper 32 Quilt wins — at 550 g it is 69 g (11%) lighter than the Sea to Summit Spark Pro Down 30 (619 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.