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Decathlon Forclaz MT900 UL 50+10L vs REI Co-op Flash 55

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

Decathlon Forclaz MT900 UL 50+10L is the lighter option — 45 g lighter than the REI Co-op Flash 55 (3% less weight). If grams matter to you, that is the one to beat.
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Spec Decathlon Forclaz MT900 UL 50+10L REI Co-op Flash 55
Weight 1,315 g · 1.315 kg · 2.90 lb 1,360 g · 1.360 kg · 3.00 lb
Brand Decathlon REI Co-op
Category Backpack Backpack
Decathlon Forclaz MT900 UL 50+10L
1,315 g

Affordable ultralight backpacking pack with 50L capacity plus 10L extension collar. Highly functional load lifters and large front pockets. Budget-friendly entr...

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REI Co-op Flash 55
1,360 g

Lightweight 55L pack designed for trail-focused backpacking.

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Decathlon Forclaz MT900 UL 50+10L vs REI Co-op Flash 55: which should you buy?

If saving weight is your priority, the Decathlon Forclaz MT900 UL 50+10L wins — at 1,315 g it is 45 g (3%) lighter than the REI Co-op Flash 55 (1,360 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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