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Durston Gear Kakwa 40 vs Gregory Optic 48

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

Durston Gear Kakwa 40 is the lighter option — 575 g lighter than the Gregory Optic 48 (42% less weight). If grams matter to you, that is the one to beat.
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Spec Durston Gear Kakwa 40 Gregory Optic 48
Weight 795 g · 0.795 kg · 1.75 lb 1,370 g · 1.370 kg · 3.02 lb
Brand Durston Gear Gregory
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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Gregory Optic 48
1,370 g

Lightweight 48L trail pack with suspended mesh back panel.

Full details →

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Durston Gear Kakwa 40 vs Gregory Optic 48: which should you buy?

If saving weight is your priority, the Durston Gear Kakwa 40 wins — at 795 g it is 575 g (42%) lighter than the Gregory Optic 48 (1,370 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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