Sea to Summit Spark 30 Sleeping Bag vs Western Mountaineering AstraLite 26°F Sleeping Bag
Weight and specs compared for 2026 — and which one to choose.
Ultralight 30°F mummy bag filled with 850+ loft down. Differential cut and ripstop shell deliver excellent warmth-to-weight ratio.
Check price Full details →Premium 26°F sleeping bag with 850-fill ethically sourced goose down. Continuous-baffle construction eliminates cold spots.
Check price Full details →Sea to Summit Spark 30 Sleeping Bag vs Western Mountaineering AstraLite 26°F 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 14 g (3%) lighter than the Western Mountaineering AstraLite 26°F Sleeping Bag (496 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.