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Western Mountaineering AstraLite 26°F Sleeping Bag vs Zpacks Sleeping Bag 20°F

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

Zpacks Sleeping Bag 20°F is the lighter option — 99 g lighter than the Western Mountaineering AstraLite 26°F Sleeping Bag (20% less weight). If grams matter to you, that is the one to beat.
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Spec Western Mountaineering AstraLite 26°F Sleeping Bag Zpacks Sleeping Bag 20°F
Weight 496 g · 0.496 kg · 1.09 lb 397 g · 0.397 kg · 0.88 lb
Brand Western Mountaineering Zpacks
Category Sleep System Sleep System
Western Mountaineering AstraLite 26°F Sleeping Bag
496 g

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

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Zpacks Sleeping Bag 20°F
397 g

Ultralight 900-fill down sleeping bag rated to 20°F.

Full details →

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Western Mountaineering AstraLite 26°F Sleeping Bag vs Zpacks Sleeping Bag 20°F: which should you buy?

If saving weight is your priority, the Zpacks Sleeping Bag 20°F wins — at 397 g it is 99 g (20%) 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.

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