Sea to Summit Spark Pro Down 30 vs Zpacks Zip Around Quilt 900
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 →Premium 900-fill down quilt with full zip for sleeping bag versatility. Draft collar and pad attachment straps for secure, warm nights below freezing.
Check price Full details →Sea to Summit Spark Pro Down 30 vs Zpacks Zip Around Quilt 900: which should you buy?
If saving weight is your priority, the Zpacks Zip Around Quilt 900 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.