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Fjällräven Kaipak 38 vs Gregory Optic 48

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

Gregory Optic 48 is the lighter option — 230 g lighter than the Fjällräven Kaipak 38 (14% less weight). If grams matter to you, that is the one to beat.
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Spec Fjällräven Kaipak 38 Gregory Optic 48
Weight 1,600 g · 1.600 kg · 3.53 lb 1,370 g · 1.370 kg · 3.02 lb
Brand Fjällräven Gregory
Category Backpack Backpack
Fjällräven Kaipak 38
1,600 g

38L trekking backpack made from recycled polyester and organic cotton G-1000 fabric. Features supportive carrying system with removable waist belt and snow lock...

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Gregory Optic 48
1,370 g

Lightweight 48L trail pack with suspended mesh back panel.

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Fjällräven Kaipak 38 vs Gregory Optic 48: which should you buy?

If saving weight is your priority, the Gregory Optic 48 wins — at 1,370 g it is 230 g (14%) lighter than the Fjällräven Kaipak 38 (1,600 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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