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Black Diamond Speed 40 vs Osprey Aether 65

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

Black Diamond Speed 40 is the lighter option — 1,030 g lighter than the Osprey Aether 65 (47% less weight). If grams matter to you, that is the one to beat.
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Spec Black Diamond Speed 40 Osprey Aether 65
Weight 1,180 g · 1.180 kg · 2.60 lb 2,210 g · 2.210 kg · 4.87 lb
Brand Black Diamond Osprey
Category Backpack Backpack
Black Diamond Speed 40
1,180 g

Lightweight 40L alpine pack with removable framesheet.

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Osprey Aether 65
2,210 g

Heavy-load backpacking pack with Fit-on-the-Fly adjustable harness and hipbelt and an AirScape backpanel for extended trips.

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Black Diamond Speed 40 vs Osprey Aether 65: which should you buy?

If saving weight is your priority, the Black Diamond Speed 40 wins — at 1,180 g it is 1,030 g (47%) lighter than the Osprey Aether 65 (2,210 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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