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REI Co-op Flash 55 vs Salomon ADV Skin 12

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

Salomon ADV Skin 12 is the lighter option — 1,100 g lighter than the REI Co-op Flash 55 (81% less weight). If grams matter to you, that is the one to beat.
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Spec REI Co-op Flash 55 Salomon ADV Skin 12
Weight 1,360 g · 1.360 kg · 3.00 lb 260 g · 0.260 kg · 0.57 lb
Brand REI Co-op Salomon
Category Backpack Backpack
REI Co-op Flash 55
1,360 g

Lightweight 55L pack designed for trail-focused backpacking.

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Salomon ADV Skin 12
260 g

Ultra-light 12L trail running and fastpacking vest.

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REI Co-op Flash 55 vs Salomon ADV Skin 12: which should you buy?

If saving weight is your priority, the Salomon ADV Skin 12 wins — at 260 g it is 1,100 g (81%) lighter than the REI Co-op Flash 55 (1,360 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 backpack page, or browse the full gear weight database.

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