Sea to Summit Ember Down Sleeping Bag vs Sea to Summit Spark Pro Down 30
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.
Ultralight mummy bag rated to 30F (-1C) with 950+ fill-power Ultra-Dry Down. 10-denier shell, shoulder and footbox zippers for temperature control.
Building a pack? Add either one to your HikeLoad list, or drop its weight into the base weight calculator, and see what it does to your total weight.
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Sea to Summit Ember Down Sleeping Bag vs Sea to Summit Spark Pro Down 30: which should you buy?
If saving weight is your priority, the Sea to Summit Ember Down Sleeping Bag wins — at 609 g it is 10 g (2%) 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.