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Osprey Sirrus 36 vs Zpacks Nero Classic Backpack
Weight and specs compared for 2026 — and which one to choose.
Zpacks Nero Classic Backpack is the lighter option — 931 g lighter than the Osprey Sirrus 36 (76% less weight). If grams matter to you, that is the one to beat.
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.
Check price Full details →Osprey Sirrus 36 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 931 g (76%) lighter than the Osprey Sirrus 36 (1,220 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.