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Zpacks Arc Blast 55L vs Zpacks Nero Classic 40L
Weight and specs compared for 2026 — and which one to choose.
Zpacks Nero Classic 40L is the lighter option — 161 g lighter than the Zpacks Arc Blast 55L (36% less weight). If grams matter to you, that is the one to beat.
Zpacks Arc Blast 55L
450 g
Frameless Dyneema pack with excellent load carry for its weight.
Full details →Zpacks Nero Classic 40L
289 g
Frameless ultralight pack in 30L or 40L, built from Dyneema CF fabric. One of the lightest load-carrying packs available for thru-hiking.
Check price Full details →Zpacks Arc Blast 55L 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 161 g (36%) lighter than the Zpacks Arc Blast 55L (450 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.