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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.

No winner on weight yet. The recorded weights have not both been verified on the same basis. Size, included parts and single-item versus pair weights can differ. Check the linked sources before choosing a replacement.

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Spec Sea to Summit Spark 30 Sleeping Bag Western Mountaineering AstraLite 26°F Sleeping Bag
Weight 482 g · 0.482 kg · 1.06 lb
size Regular, 30°F / -1°C
 454 g · 0.454 kg · 1.00 lb
size Regular (5'8" / 180 cm), AstraLite Top Quilt 26°F
Brand Sea to Summit Western Mountaineering
Category Sleep System Sleep System
Sea to Summit Spark 30 Sleeping Bag
482 g

Ultralight 30°F mummy bag filled with 850+ loft down. Differential cut and ripstop shell deliver excellent warmth-to-weight ratio.

See it in your base weight → Full details →
Western Mountaineering AstraLite 26°F Sleeping Bag
454 g

Premium 26°F sleeping bag with 850-fill ethically sourced goose down. Continuous-baffle construction eliminates cold spots.

See it in your base weight → Full details →

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Sea to Summit Spark 30 Sleeping Bag vs Western Mountaineering AstraLite 26°F Sleeping Bag: which should you buy?

The listed weights alone are not enough to choose between these products. Confirm the size, included parts and weight basis against each source; choose equipment for the function and fit you need.

See where both rank against everything else in this category on the lightest sleep system page, or browse the full gear weight database.

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