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Black Diamond Speed 40 vs Patagonia Ascensionist 35L

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

Patagonia Ascensionist 35L is the lighter option — 442 g lighter than the Black Diamond Speed 40 (37% less weight). If grams matter to you, that is the one to beat.
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Spec Black Diamond Speed 40 Patagonia Ascensionist 35L
Weight 1,180 g · 1.180 kg · 2.60 lb 738 g · 0.738 kg · 1.63 lb
Brand Black Diamond Patagonia
Category Backpack Backpack
Black Diamond Speed 40
1,180 g

Lightweight 40L alpine pack with removable framesheet.

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Patagonia Ascensionist 35L
738 g

Lightweight climbing and hiking 35L pack.

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Black Diamond Speed 40 vs Patagonia Ascensionist 35L: which should you buy?

If saving weight is your priority, the Patagonia Ascensionist 35L wins — at 738 g it is 442 g (37%) 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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