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Osprey Atmos AG 50 vs Zpacks Nero Pro

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

Zpacks Nero Pro is the lighter option — 1,577 g lighter than the Osprey Atmos AG 50 (83% less weight). If grams matter to you, that is the one to beat.
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Spec Osprey Atmos AG 50 Zpacks Nero Pro
Weight 1,900 g · 1.900 kg · 4.19 lb 323 g · 0.323 kg · 0.71 lb
Brand Osprey Zpacks
Category Backpack Backpack
Osprey Atmos AG 50
1,900 g

Versatile 50L Anti-Gravity pack for multi-day adventures.

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Zpacks Nero Pro
323 g

Frameless ultralight 30L backpack. Advanced storage options with premium materials for demanding adventures.

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Osprey Atmos AG 50 vs Zpacks Nero Pro: which should you buy?

If saving weight is your priority, the Zpacks Nero Pro wins — at 323 g it is 1,577 g (83%) lighter than the Osprey Atmos AG 50 (1,900 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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