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Cumulus Aerial 250 vs Western Mountaineering AstraLite

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

Cumulus Aerial 250 is the lighter option — 111 g lighter than the Western Mountaineering AstraLite (22% less weight). If grams matter to you, that is the one to beat.
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Spec Cumulus Aerial 250 Western Mountaineering AstraLite
Weight 385 g · 0.385 kg · 0.85 lb 496 g · 0.496 kg · 1.09 lb
Brand Cumulus Western Mountaineering
Category Sleep System Sleep System
Cumulus Aerial 250
385 g

Ultralight down sleeping bag with 900 FP goose down, single-layer design with no zipper, perfect for thru-hiking and backpacking.

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Western Mountaineering AstraLite
496 g

Ultralight 3-season sleeping bag with 850fp down and 12D shell. Designed for fast-and-light alpine pursuits and long trail journeys.

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Cumulus Aerial 250 vs Western Mountaineering AstraLite: which should you buy?

If saving weight is your priority, the Cumulus Aerial 250 wins — at 385 g it is 111 g (22%) lighter than the Western Mountaineering AstraLite (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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