Six Moon Designs Fusion 55 vs Zpacks Arc Haul Ultra 60

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

Zpacks Arc Haul Ultra 60 is the lighter option — 4 g lighter than the Six Moon Designs Fusion 55 (1% less weight). If grams matter to you, that is the one to beat.

Spec	Six Moon Designs Fusion 55	Zpacks Arc Haul Ultra 60
Weight	622 g · 0.622 kg · 1.37 lb	618 g · 0.618 kg · 1.36 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 60

618 g

Ultralight 60L thru-hiking pack with carbon fiber frame and Ultra 100X Dyneema fabric. Seam-taped roll-top design with side water bottle pockets.

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

If saving weight is your priority, the Zpacks Arc Haul Ultra 60 wins — at 618 g it is 4 g (1%) lighter than the Six Moon Designs Fusion 55 (622 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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