Sea to Summit Ember Down Sleeping Bag vs Zpacks Zip Around Sleeping Bag 20°F
Weight and specs compared for 2026 — and which one to choose.
850+ Ultradry down sleeping bag rated to 9°C; packs to 5.1L with soft Thermolite liner and recycled shell fabric.
Check price Full details →900-fill down sleeping bag with full-length side zipper for easy entry and temperature regulation. Rated to -7°C, excellent for thru-hikers seeking packable, ve...
Check price Full details →Sea to Summit Ember Down Sleeping Bag vs Zpacks Zip Around Sleeping Bag 20°F: which should you buy?
If saving weight is your priority, the Sea to Summit Ember Down Sleeping Bag wins — at 609 g it is 3 g (0%) lighter than the Zpacks Zip Around Sleeping Bag 20°F (612 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.