Sea to Summit Spark Pro Down 30 vs Zpacks Zip Around Quilt 20°F
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.
Check price Full details →Down quilt rated to 20°F with 900-fill power down and 412g of fill. Unique zip-around attachment system. Popular choice for thru-hikers seeking versatility.
Check price Full details →Sea to Summit Spark Pro Down 30 vs Zpacks Zip Around Quilt 20°F: which should you buy?
If saving weight is your priority, the Zpacks Zip Around Quilt 20°F wins — at 612 g it is 7 g (1%) 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.