Fjällräven Kaipak 38 vs Hyperlite Mountain Gear Prism 40L
Weight and specs compared for 2026 — and which one to choose.
38L trekking backpack made from recycled polyester and organic cotton G-1000 fabric. Features supportive carrying system with removable waist belt and snow lock...
Full details →Technical alpine pack in DCH150 Dyneema with crampon pouch, ice tool carry, and removable lid. Load capacity up to 22kg.
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Fjällräven Kaipak 38 vs Hyperlite Mountain Gear Prism 40L: which should you buy?
If saving weight is your priority, the Hyperlite Mountain Gear Prism 40L wins — at 827 g it is 773 g (48%) 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.