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ULA Catalyst vs Zpacks Arc Haul Ultra 60L Backpack

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

Zpacks Arc Haul Ultra 60L Backpack is the lighter option — 635 g lighter than the ULA Catalyst (50% less weight). If grams matter to you, that is the one to beat.
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Spec ULA Catalyst Zpacks Arc Haul Ultra 60L Backpack
Weight 1,259 g · 1.259 kg · 2.78 lb
as listed; page does not state size
 624 g · 0.624 kg · 1.38 lb
as listed, size/variant not specified on page
Brand ULA Zpacks
Category Backpack Backpack
ULA Catalyst
1,259 g

Versatile 68L semi-frameless pack for loaded trips.

See it in your base weight → Full details →
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.

See it in your base weight → Full details →

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ULA Catalyst vs Zpacks Arc Haul Ultra 60L Backpack: which should you buy?

If saving weight is your priority, the Zpacks Arc Haul Ultra 60L Backpack wins — at 624 g it is 635 g (50%) lighter than the ULA Catalyst (1,259 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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