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Cumulus Panyam 600 vs Western Mountaineering AlpinLite 20

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

Western Mountaineering AlpinLite 20 is the lighter option — 90 g lighter than the Cumulus Panyam 600 (9% less weight). If grams matter to you, that is the one to beat.
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Spec Cumulus Panyam 600 Western Mountaineering AlpinLite 20
Weight 969 g · 0.969 kg · 2.14 lb
as listed; maat niet vermeld op de pagina (waarschijnlijk standaardlengte, niet bevestigd)
 879 g · 0.879 kg · 1.94 lb
size 6'0" (180 cm), 20°F, total weight; 1 lb 15 oz omgerekend
Brand Cumulus Western Mountaineering
Category Sleep System Sleep System
Cumulus Panyam 600
969 g

3-season down sleeping bag with 600g 850 fill power Polish goose down, Pertex Quantum shell, comfort -6°C/limit -13°C, trapezoid chambers

See it in your base weight → Full details →
Western Mountaineering AlpinLite 20
879 g

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

See it in your base weight → Full details →

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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Cumulus Panyam 600 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 90 g (9%) lighter than the Cumulus Panyam 600 (969 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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