Durston Gear Kakwa 55 vs REI Co-op Flash Air 50
Weight and specs compared for 2026 — and which one to choose.
Versatile 55L lightweight pack in UltraGrid fabric with aluminum frame stays. Excellent load transfer for heavier loads up to 40 lbs.
Ultralight 50L pack with 3D contoured hip belt and ventilated back panel. Made from PFAS-free UHMWPE fabric with DWR coating.
Building a pack? Add either one to your HikeLoad list, or drop its weight into the base weight calculator, and see what it does to your total weight.
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Durston Gear Kakwa 55 vs REI Co-op Flash Air 50: which should you buy?
If saving weight is your priority, the REI Co-op Flash Air 50 wins — at 868 g it is 2 g (0%) lighter than the Durston Gear Kakwa 55 (870 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.