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REI Co-op Magma 15 vs Sea to Summit Aeros Ultralight Pillow

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

Sea to Summit Aeros Ultralight Pillow is the lighter option — 791 g lighter than the REI Co-op Magma 15 (93% less weight). If grams matter to you, that is the one to beat.
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Spec REI Co-op Magma 15 Sea to Summit Aeros Ultralight Pillow
Weight 850 g · 0.850 kg · 1.87 lb 59 g · 0.059 kg · 0.13 lb
Brand REI Co-op Sea to Summit
Category Sleep System Sleep System
REI Co-op Magma 15
850 g

850-fill down sleeping bag rated to 15°F. Great value.

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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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REI Co-op Magma 15 vs Sea to Summit Aeros Ultralight Pillow: which should you buy?

If saving weight is your priority, the Sea to Summit Aeros Ultralight Pillow wins — at 59 g it is 791 g (93%) lighter than the REI Co-op Magma 15 (850 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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