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Six Moon Designs Fusion 55 vs Zpacks Arc Haul Ultra 50L

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

No winner on weight yet. The recorded weights have not both been verified on the same basis. Size, included parts and single-item versus pair weights can differ. Check the linked sources before choosing a replacement.

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Spec Six Moon Designs Fusion 55 Zpacks Arc Haul Ultra 50L
Weight 622 g · 0.622 kg · 1.37 lb 606 g · 0.606 kg · 1.34 lb
as listed; page does not state size (belt and straps included)
Brand Six Moon Designs Zpacks
Category Backpack Backpack
Six Moon Designs Fusion 55
622 g

Ultralight 55L frameless Dyneema pack.

See it in your base weight → Full details →
Zpacks Arc Haul Ultra 50L
606 g

Ultralight thru-hiking pack with carbon fiber frame and Dyneema Composite Hybrid fabric. Features roll-top closure and adjustable torso fit.

See it in your base weight → Full details →

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Six Moon Designs Fusion 55 vs Zpacks Arc Haul Ultra 50L: which should you buy?

The listed weights alone are not enough to choose between these products. Confirm the size, included parts and weight basis against each source; choose equipment for the function and fit you need.

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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