Sea to Summit Ember XT 0°C Sleeping Bag vs Sea to Summit Spark 30 Sleeping Bag
Weight and specs compared for 2026 — and which one to choose.
Ultralight 0°C rated bag with 850+ UltraDry Down insulation. Stretch-knit lining and sculpted hood for packability and comfort.
Ultralight 30°F mummy bag filled with 850+ loft down. Differential cut and ripstop shell deliver excellent warmth-to-weight ratio.
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 XT 0°C Sleeping Bag vs Sea to Summit Spark 30 Sleeping Bag: which should you buy?
If saving weight is your priority, the Sea to Summit Spark 30 Sleeping Bag wins — at 482 g it is 127 g (21%) lighter than the Sea to Summit Ember XT 0°C 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.