Black Diamond Speed 40 vs Zpacks Nero Classic 50L

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

Zpacks Nero Classic 50L is the lighter option — 891 g lighter than the Black Diamond Speed 40 (76% less weight). If grams matter to you, that is the one to beat.

Spec	Black Diamond Speed 40	Zpacks Nero Classic 50L
Weight	1,180 g · 1.180 kg · 2.60 lb	289 g · 0.289 kg · 0.64 lb
Brand	Black Diamond	Zpacks
Category	Backpack	Backpack

Black Diamond Speed 40

1,180 g

Lightweight 40L alpine pack with removable framesheet.

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Zpacks Nero Classic 50L

289 g

Frameless ultralight backpack made from Dyneema Composite Fabric. Minimalist design for gram-conscious hikers and ultralight enthusiasts.

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Black Diamond Speed 40 vs Zpacks Nero Classic 50L: which should you buy?

If saving weight is your priority, the Zpacks Nero Classic 50L wins — at 289 g it is 891 g (76%) lighter than the Black Diamond Speed 40 (1,180 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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