Osprey Eja Pro 55 vs Zpacks Arc Haul Ultra 50L

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

Zpacks Arc Haul Ultra 50L is the lighter option — 270 g lighter than the Osprey Eja Pro 55 (31% less weight). If grams matter to you, that is the one to beat.

Spec	Osprey Eja Pro 55	Zpacks Arc Haul Ultra 50L
Weight	876 g · 0.876 kg · 1.93 lb	606 g · 0.606 kg · 1.34 lb
Brand	Osprey	Zpacks
Category	Backpack	Backpack

Osprey Eja Pro 55

876 g

Women's sub-1kg thru-hiking pack built from UHMWPE fabric with an AirSpeed suspended mesh back and removable top lid.

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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.

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Osprey Eja Pro 55 vs Zpacks Arc Haul Ultra 50L: which should you buy?

If saving weight is your priority, the Zpacks Arc Haul Ultra 50L wins — at 606 g it is 270 g (31%) lighter than the Osprey Eja Pro 55 (876 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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