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Marmot Plasma 15°F vs Western Mountaineering AstraLite

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

Western Mountaineering AstraLite is the lighter option — 354 g lighter than the Marmot Plasma 15°F (42% less weight). If grams matter to you, that is the one to beat.
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Spec Marmot Plasma 15°F Western Mountaineering AstraLite
Weight 850 g · 0.850 kg · 1.87 lb 496 g · 0.496 kg · 1.09 lb
Brand Marmot Western Mountaineering
Category Sleep System Sleep System
Marmot Plasma 15°F
850 g

800-fill down sleeping bag rated to 15°F (-9°C).

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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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Marmot Plasma 15°F vs Western Mountaineering AstraLite: which should you buy?

If saving weight is your priority, the Western Mountaineering AstraLite wins — at 496 g it is 354 g (42%) lighter than the Marmot Plasma 15°F (850 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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