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Durston Kakwa 55 (2025) vs REI Co-op Flash 45

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

Durston Kakwa 55 (2025) is the lighter option — 340 g lighter than the REI Co-op Flash 45 (29% less weight). If grams matter to you, that is the one to beat.
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Spec Durston Kakwa 55 (2025) REI Co-op Flash 45
Weight 850 g · 0.850 kg · 1.87 lb 1,190 g · 1.190 kg · 2.62 lb
Brand Durston REI Co-op
Category Backpack Backpack
Durston Kakwa 55 (2025)
850 g

55L ultralight thru-hiking pack in Ultra 200X fabric with tubular aluminum frame, carries up to 20kg comfortably.

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REI Co-op Flash 45
1,190 g

Lightweight 45L versatile backpacking pack.

Full details →

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Durston Kakwa 55 (2025) vs REI Co-op Flash 45: which should you buy?

If saving weight is your priority, the Durston Kakwa 55 (2025) wins — at 850 g it is 340 g (29%) lighter than the REI Co-op Flash 45 (1,190 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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