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Katabatic Gear Alsek 22F Sleeping Quilt vs Therm-a-Rest Vesper 32°F Sleeping Bag

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

Therm-a-Rest Vesper 32°F Sleeping Bag is the lighter option — 80 g lighter than the Katabatic Gear Alsek 22F Sleeping Quilt (13% less weight). If grams matter to you, that is the one to beat.
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Spec Katabatic Gear Alsek 22F Sleeping Quilt Therm-a-Rest Vesper 32°F Sleeping Bag
Weight 630 g · 0.630 kg · 1.39 lb 550 g · 0.550 kg · 1.21 lb
Brand Katabatic Gear Therm-a-Rest
Category Sleep System Sleep System
Katabatic Gear Alsek 22F Sleeping Quilt
630 g

3-season ultralight quilt at 22.2oz. 900 fill ExpedDRY goose down with Pertex Quantum Ripstop shell.

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Therm-a-Rest Vesper 32°F Sleeping Bag
550 g

Premium ultralight sleeping bag with 900-fill hydrophobic goose down. Rated to 32°F (0°C) with mummy fit and draft collar for warmth retention.

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Katabatic Gear Alsek 22F Sleeping Quilt vs Therm-a-Rest Vesper 32°F Sleeping Bag: which should you buy?

If saving weight is your priority, the Therm-a-Rest Vesper 32°F Sleeping Bag wins — at 550 g it is 80 g (13%) lighter than the Katabatic Gear Alsek 22F Sleeping Quilt (630 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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