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Katabatic Gear Alsek 22°F vs Sea to Summit Spark SP III

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

Katabatic Gear Alsek 22°F 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 Katabatic Gear Alsek 22°F Sea to Summit Spark SP III
Weight 454 g · 0.454 kg · 1.00 lb 709 g · 0.709 kg · 1.56 lb
Brand Katabatic Gear Sea to Summit
Category Sleep System Sleep System
Katabatic Gear Alsek 22°F
454 g

Premium 850-fill down sleeping quilt rated to 22°F.

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Sea to Summit Spark SP III
709 g

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

Full details →

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Katabatic Gear Alsek 22°F vs Sea to Summit Spark SP III: which should you buy?

If saving weight is your priority, the Katabatic Gear Alsek 22°F 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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