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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 — 226 g lighter than the Western Mountaineering MegaLite 35°F (33% less weight). If grams matter to you, that is the one to beat.
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Spec Western Mountaineering AstraLite Western Mountaineering MegaLite 35°F
Weight 454 g · 0.454 kg · 1.00 lb
size 5'8" (180 cm), the shorter of two sizes (6'4" = 496 g); no Regular/Medium label on page
 680 g · 0.680 kg · 1.50 lb
size 6'0" (180 cm), 30°F MegaLite
Brand Western Mountaineering Western Mountaineering
Category Sleep System Sleep System
Western Mountaineering AstraLite
454 g

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

See it in your base weight → Full details →
Western Mountaineering MegaLite 35°F
680 g

Ultralight 850-fill down bag for warm summer conditions.

See it in your base weight → Full details →

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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 454 g it is 226 g (33%) lighter than the Western Mountaineering MegaLite 35°F (680 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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