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3F UL Gear Qidian Pro 46+10L vs REI Co-op Flash Air 50

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

REI Co-op Flash Air 50 is the lighter option — 12 g lighter than the 3F UL Gear Qidian Pro 46+10L (1% less weight). If grams matter to you, that is the one to beat.
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Spec 3F UL Gear Qidian Pro 46+10L REI Co-op Flash Air 50
Weight 880 g · 0.880 kg · 1.94 lb 868 g · 0.868 kg · 1.91 lb
Brand 3F UL Gear REI Co-op
Category Backpack Backpack
3F UL Gear Qidian Pro 46+10L
880 g

UHMWPE blended nylon ultralight backpack with 46L main and 10L external compartment. Fits users 160-190cm with torso 15-18 inches.

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REI Co-op Flash Air 50
868 g

Ultralight 50L pack with 3D contoured hip belt and ventilated back panel. Made from PFAS-free UHMWPE fabric with DWR coating.

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3F UL Gear Qidian Pro 46+10L 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 12 g (1%) lighter than the 3F UL Gear Qidian Pro 46+10L (880 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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