Durston Gear Kakwa 55 UltraGrid Pack Small vs Zpacks Nero Classic 40L
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 →Frameless ultralight pack in 30L or 40L, built from Dyneema CF fabric. One of the lightest load-carrying packs available for thru-hiking.
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Durston Gear Kakwa 55 UltraGrid Pack Small vs Zpacks Nero Classic 40L: which should you buy?
If saving weight is your priority, the Zpacks Nero Classic 40L wins — at 289 g it is 531 g (65%) lighter than the Durston Gear Kakwa 55 UltraGrid Pack Small (820 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.