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ULA Ohm 2.0 vs Zpacks Arc Haul Ultra 50L

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

ULA Ohm 2.0 is the lighter option — 39 g lighter than the Zpacks Arc Haul Ultra 50L (6% less weight). If grams matter to you, that is the one to beat.
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Spec ULA Ohm 2.0 Zpacks Arc Haul Ultra 50L
Weight 567 g · 0.567 kg · 1.25 lb 606 g · 0.606 kg · 1.34 lb
as listed; page does not state size (belt and straps included)
Brand ULA Zpacks
Category Backpack Backpack
ULA Ohm 2.0
567 g

Ultralight 50L frameless pack with framesheet option.

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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ULA Ohm 2.0 vs Zpacks Arc Haul Ultra 50L: which should you buy?

If saving weight is your priority, the ULA Ohm 2.0 wins — at 567 g it is 39 g (6%) lighter than the Zpacks Arc Haul Ultra 50L (606 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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