Nemo Disco 15°F vs Western Mountaineering AlpinLite 20
Weight and specs compared for 2026 — and which one to choose.
Spoon-shaped sleeping bag for side sleepers. 650-fill down.
Roomy 20F mummy bag with 850+ goose down and continuous baffles, balancing warmth, comfort and low weight.
Building a pack? Add either one to your HikeLoad list, or drop its weight into the base weight calculator, and see what it does to your total 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.