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Black Diamond Speed 40 vs Zpacks Nero Classic Ultra Backpack
Weight and specs compared for 2026 — and which one to choose.
Zpacks Nero Classic Ultra Backpack 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.
Black Diamond Speed 40
1,180 g
Lightweight 40L alpine pack with removable framesheet.
Full details →Zpacks Nero Classic Ultra Backpack
289 g
Frameless ultralight backpack made from Dyneema Composite Fabric. Minimalist design for SUL hikers. Top-loading with roll-top closure.
Check price Full details →Black Diamond Speed 40 vs Zpacks Nero Classic Ultra Backpack: which should you buy?
If saving weight is your priority, the Zpacks Nero Classic Ultra Backpack 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.