Durston Gear Kakwa 55 UltraGrid Pack Small vs Hyperlite Mountain Gear Unbound 40
Weight and specs compared for 2026 — and which one to choose.
Updated ultralight pack size S, 28.9oz, with improved hipbelt and durability
Full details →40L Dyneema Composite Hybrid pack with internal frame and waterproof roll-top closure. Built for alpine and storm-prone conditions.
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Durston Gear Kakwa 55 UltraGrid Pack Small vs Hyperlite Mountain Gear Unbound 40: which should you buy?
If saving weight is your priority, the Durston Gear Kakwa 55 UltraGrid Pack Small wins — at 820 g it is 10 g (1%) 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.