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Durston Gear Kakwa 55 UltraGrid Pack Small vs REI Co-op Flash 45

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

Durston Gear Kakwa 55 UltraGrid Pack Small is the lighter option — 370 g lighter than the REI Co-op Flash 45 (31% less weight). If grams matter to you, that is the one to beat.
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Spec Durston Gear Kakwa 55 UltraGrid Pack Small REI Co-op Flash 45
Weight 820 g · 0.820 kg · 1.81 lb 1,190 g · 1.190 kg · 2.62 lb
Brand Durston Gear REI Co-op
Category Backpack Backpack
Durston Gear Kakwa 55 UltraGrid Pack Small
820 g

Updated ultralight pack size S, 28.9oz, with improved hipbelt and durability

Full details →
REI Co-op Flash 45
1,190 g

Lightweight 45L versatile backpacking pack.

Full details →

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Durston Gear Kakwa 55 UltraGrid Pack Small vs REI Co-op Flash 45: which should you buy?

If saving weight is your priority, the Durston Gear Kakwa 55 UltraGrid Pack Small wins — at 820 g it is 370 g (31%) 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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