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

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

Forclaz MT900 UL 50+10 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 Forclaz MT900 UL 50+10 REI Co-op Flash 55
Weight 1,315 g · 1.315 kg · 2.90 lb
as listed (2.9 lbs, afgerond door de fabrikant), 50+10 L
 1,360 g · 1.360 kg · 3.00 lb
Brand Forclaz REI Co-op
Category Backpack Backpack
Forclaz MT900 UL 50+10
1,315 g

Decathlon ultralight thru-hiking backpack with 50+10L capacity, roll-top closure and removable components for paring down trail weight.

See it in your base weight → Full details →
REI Co-op Flash 55
1,360 g

Lightweight 55L pack designed for trail-focused backpacking.

See it in your base weight → Full details →

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

If saving weight is your priority, the Forclaz MT900 UL 50+10 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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