Western Mountaineering AstraLite vs Western Mountaineering MegaLite 35°F

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

Western Mountaineering AstraLite is the lighter option — 14 g lighter than the Western Mountaineering MegaLite 35°F (3% less weight). If grams matter to you, that is the one to beat.

Spec	Western Mountaineering AstraLite	Western Mountaineering MegaLite 35°F
Weight	496 g · 0.496 kg · 1.09 lb	510 g · 0.510 kg · 1.12 lb
Brand	Western Mountaineering	Western Mountaineering
Category	Sleep System	Sleep System

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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Western Mountaineering MegaLite 35°F

510 g

Ultralight 850-fill down bag for warm summer conditions.

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Western Mountaineering AstraLite vs Western Mountaineering MegaLite 35°F: which should you buy?

If saving weight is your priority, the Western Mountaineering AstraLite wins — at 496 g it is 14 g (3%) lighter than the Western Mountaineering MegaLite 35°F (510 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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