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Six Moon Designs Fusion 55 vs Zpacks Arc Haul Ultra 60L Backpack

Weight and specs compared for 2026 — and which one to choose.

Six Moon Designs Fusion 55 is the lighter option — 2 g lighter than the Zpacks Arc Haul Ultra 60L Backpack (0% less weight). If grams matter to you, that is the one to beat.
Spec Six Moon Designs Fusion 55 Zpacks Arc Haul Ultra 60L Backpack
Weight 622 g · 0.622 kg · 1.37 lb 624 g · 0.624 kg · 1.38 lb
Brand Six Moon Designs Zpacks
Category Backpack Backpack
Six Moon Designs Fusion 55
622 g

Ultralight 55L frameless Dyneema pack.

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Zpacks Arc Haul Ultra 60L Backpack
624 g

Ultralight 60L thru-hiking pack with DCF fabric and arc carbon fiber frame for load transfer. Weight varies by configuration.

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Six Moon Designs Fusion 55 vs Zpacks Arc Haul Ultra 60L Backpack: which should you buy?

If saving weight is your priority, the Six Moon Designs Fusion 55 wins — at 622 g it is 2 g (0%) lighter than the Zpacks Arc Haul Ultra 60L Backpack (624 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.

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