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Black Diamond Speed 40 vs Forclaz MT900 UL 50+10

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

Forclaz MT900 UL 50+10 is the lighter option — 300 g lighter than the Black Diamond Speed 40 (25% less weight). If grams matter to you, that is the one to beat.
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Spec Black Diamond Speed 40 Forclaz MT900 UL 50+10
Weight 1,180 g · 1.180 kg · 2.60 lb 880 g · 0.880 kg · 1.94 lb
Brand Black Diamond Forclaz
Category Backpack Backpack
Black Diamond Speed 40
1,180 g

Lightweight 40L alpine pack with removable framesheet.

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Forclaz MT900 UL 50+10
880 g

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

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Black Diamond Speed 40 vs Forclaz MT900 UL 50+10: which should you buy?

If saving weight is your priority, the Forclaz MT900 UL 50+10 wins — at 880 g it is 300 g (25%) lighter than the Black Diamond Speed 40 (1,180 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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