Sea to Summit Ember Down Sleeping Bag vs Therm-a-Rest Vesper 20 Quilt
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.
Full details →Ultralight sleeping quilt with 900-fill hydrophobic goose down rated to 20F (-7C). Hood-quilt hybrid design with Pertex Quantum shell for minimal weight.
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Sea to Summit Ember Down Sleeping Bag vs Therm-a-Rest Vesper 20 Quilt: which should you buy?
If saving weight is your priority, the Therm-a-Rest Vesper 20 Quilt wins — at 550 g it is 59 g (10%) lighter than the Sea to Summit Ember Down Sleeping Bag (609 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.