Patagonia Ascensionist 35L vs Zpacks Nero Classic Backpack

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

Zpacks Nero Classic Backpack is the lighter option — 449 g lighter than the Patagonia Ascensionist 35L (61% less weight). If grams matter to you, that is the one to beat.

Spec	Patagonia Ascensionist 35L	Zpacks Nero Classic Backpack
Weight	738 g · 0.738 kg · 1.63 lb	289 g · 0.289 kg · 0.64 lb
Brand	Patagonia	Zpacks
Category	Backpack	Backpack

Patagonia Ascensionist 35L

738 g

Lightweight climbing and hiking 35L pack.

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Zpacks Nero Classic Backpack

289 g

Ultralight frameless Dyneema Composite backpack, just 289g. Roll-top closure with mesh side pockets. Ideal for SUL hikers carrying under 10 lbs base weight.

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Patagonia Ascensionist 35L vs Zpacks Nero Classic Backpack: which should you buy?

If saving weight is your priority, the Zpacks Nero Classic Backpack wins — at 289 g it is 449 g (61%) lighter than the Patagonia Ascensionist 35L (738 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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