Hyperlite Mountain Gear Unbound 40 vs Zpacks Arc Haul Ultra 60
Weight and specs compared for 2026 — and which one to choose.
40L Dyneema Composite Hybrid pack with internal frame and waterproof roll-top closure. Built for alpine and storm-prone conditions.
Full details →Ultralight 60L thru-hiking pack with carbon fiber frame and Ultra 100X Dyneema fabric. Seam-taped roll-top design with side water bottle pockets.
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Hyperlite Mountain Gear Unbound 40 vs Zpacks Arc Haul Ultra 60: which should you buy?
If saving weight is your priority, the Zpacks Arc Haul Ultra 60 wins — at 618 g it is 212 g (26%) lighter than the Hyperlite Mountain Gear Unbound 40 (830 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.