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Sea to Summit Spark SP III vs Western Mountaineering AstraLite Quilt 26F

Weight and specs compared for 2026 — and which one to choose.

Western Mountaineering AstraLite Quilt 26F is the lighter option — 255 g lighter than the Sea to Summit Spark SP III (36% less weight). If grams matter to you, that is the one to beat.
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Spec Sea to Summit Spark SP III Western Mountaineering AstraLite Quilt 26F
Weight 709 g · 0.709 kg · 1.56 lb 454 g · 0.454 kg · 1.00 lb
Brand Sea to Summit Western Mountaineering
Category Sleep System Sleep System
Sea to Summit Spark SP III
709 g

850-fill down sleeping bag rated to 0°C / 32°F.

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Western Mountaineering AstraLite Quilt 26F
454 g

First quilt from Western Mountaineering. 850fp European down, rated to 26F. 10D/12D shell. Extremely packable at 454g. Premium craftsmanship.

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Sea to Summit Spark SP III vs Western Mountaineering AstraLite Quilt 26F: which should you buy?

If saving weight is your priority, the Western Mountaineering AstraLite Quilt 26F wins — at 454 g it is 255 g (36%) lighter than the Sea to Summit Spark SP III (709 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.

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