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REI Co-op Flash 45 vs Six Moon Designs Minimalist V2

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

REI Co-op Flash 45 is the lighter option — 22 g lighter than the Six Moon Designs Minimalist V2 (2% less weight). If grams matter to you, that is the one to beat.
Spec REI Co-op Flash 45 Six Moon Designs Minimalist V2
Weight 1,190 g · 1.190 kg · 2.62 lb 1,212 g · 1.212 kg · 2.67 lb
Brand REI Co-op Six Moon Designs
Category Backpack Backpack
REI Co-op Flash 45
1,190 g

Lightweight 45L versatile backpacking pack.

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Six Moon Designs Minimalist V2
1,212 g

Full-featured 50L ultralight pack in Robic nylon. Removable frame and hip belt, multiple pockets and three harness options; fits a bear canister.

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REI Co-op Flash 45 vs Six Moon Designs Minimalist V2: which should you buy?

If saving weight is your priority, the REI Co-op Flash 45 wins — at 1,190 g it is 22 g (2%) lighter than the Six Moon Designs Minimalist V2 (1,212 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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