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Durston Gear Kakwa 40 vs Osprey Atmos AG 65

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

Durston Gear Kakwa 40 is the lighter option — 1,385 g lighter than the Osprey Atmos AG 65 (64% less weight). If grams matter to you, that is the one to beat.
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Spec Durston Gear Kakwa 40 Osprey Atmos AG 65
Weight 795 g · 0.795 kg · 1.75 lb 2,180 g · 2.180 kg · 4.81 lb
Brand Durston Gear Osprey
Category Backpack Backpack
Durston Gear Kakwa 40
795 g

Ultralight 40L internal-frame thru-hiking pack in Ultra 200X fabric, with a hollow aluminum U-frame and 15L of external storage.

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Osprey Atmos AG 65
2,180 g

Full-featured 65L pack with Anti-Gravity suspension. Ideal for extended trips.

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Durston Gear Kakwa 40 vs Osprey Atmos AG 65: which should you buy?

If saving weight is your priority, the Durston Gear Kakwa 40 wins — at 795 g it is 1,385 g (64%) lighter than the Osprey Atmos AG 65 (2,180 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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