Forclaz MT900 UL 50+10 vs REI Co-op Flash Air 50
Weight and specs compared for 2026 — and which one to choose.
Decathlon ultralight thru-hiking backpack with 50+10L capacity, roll-top closure and removable components for paring down trail weight.
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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Forclaz MT900 UL 50+10 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 447 g (34%) lighter than the Forclaz MT900 UL 50+10 (1,315 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.