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Sea to Summit Aeros Ultralight Pillow vs Western Mountaineering Ultralite 20°F

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

Sea to Summit Aeros Ultralight Pillow is the lighter option — 621 g lighter than the Western Mountaineering Ultralite 20°F (91% less weight). If grams matter to you, that is the one to beat.
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Spec Sea to Summit Aeros Ultralight Pillow Western Mountaineering Ultralite 20°F
Weight 59 g · 0.059 kg · 0.13 lb 680 g · 0.680 kg · 1.50 lb
Brand Sea to Summit Western Mountaineering
Category Sleep System Sleep System
Sea to Summit Aeros Ultralight Pillow
59 g

Lightest backpacking pillow at 2.1 oz. Compresses down to baseball size for ultralight trips.

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Western Mountaineering Ultralite 20°F
680 g

Premium 850-fill down sleeping bag rated to 20°F (-7°C).

Full details →

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Sea to Summit Aeros Ultralight Pillow vs Western Mountaineering Ultralite 20°F: which should you buy?

If saving weight is your priority, the Sea to Summit Aeros Ultralight Pillow wins — at 59 g it is 621 g (91%) lighter than the Western Mountaineering Ultralite 20°F (680 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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