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3F UL Gear Qidian Pro 46+10L vs REI Co-op Flash 45

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

3F UL Gear Qidian Pro 46+10L is the lighter option — 310 g lighter than the REI Co-op Flash 45 (26% 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 45
Weight 880 g · 0.880 kg · 1.94 lb 1,190 g · 1.190 kg · 2.62 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 45
1,190 g

Lightweight 45L versatile backpacking pack.

Full details →

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3F UL Gear Qidian Pro 46+10L vs REI Co-op Flash 45: which should you buy?

If saving weight is your priority, the 3F UL Gear Qidian Pro 46+10L wins — at 880 g it is 310 g (26%) 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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