Sea to Summit Aeros Ultralight Pillow vs Western Mountaineering AlpinLite 20
Weight and specs compared for 2026 — and which one to choose.
Lightest backpacking pillow at 2.1 oz. Compresses down to baseball size for ultralight trips.
Full details →Roomy 20F mummy bag with 850+ goose down and continuous baffles, balancing warmth, comfort and low weight.
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Sea to Summit Aeros Ultralight Pillow vs Western Mountaineering AlpinLite 20: which should you buy?
If saving weight is your priority, the Sea to Summit Aeros Ultralight Pillow wins — at 59 g it is 820 g (93%) lighter than the Western Mountaineering AlpinLite 20 (879 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.