Nemo Disco 15°F vs Western Mountaineering AlpinLite 20

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

Western Mountaineering AlpinLite 20 is the lighter option — 311 g lighter than the Nemo Disco 15°F (26% less weight). If grams matter to you, that is the one to beat.

Spec	Nemo Disco 15°F	Western Mountaineering AlpinLite 20
Weight	1,190 g · 1.190 kg · 2.62 lb	879 g · 0.879 kg · 1.94 lb
Brand	Nemo	Western Mountaineering
Category	Sleep System	Sleep System

Nemo Disco 15°F

1,190 g

Spoon-shaped sleeping bag for side sleepers. 650-fill down.

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Western Mountaineering AlpinLite 20

879 g

Roomy 20F mummy bag with 850+ goose down and continuous baffles, balancing warmth, comfort and low weight.

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Nemo Disco 15°F vs Western Mountaineering AlpinLite 20: which should you buy?

If saving weight is your priority, the Western Mountaineering AlpinLite 20 wins — at 879 g it is 311 g (26%) lighter than the Nemo Disco 15°F (1,190 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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