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Zpacks Arc Scout 37L vs Zpacks Bagger Ultra 25L Backpack
Weight and specs compared for 2026 — and which one to choose.
Zpacks Bagger Ultra 25L Backpack is the lighter option — 25 g lighter than the Zpacks Arc Scout 37L (6% less weight). If grams matter to you, that is the one to beat.
Zpacks Arc Scout 37L
390 g
Compact Dyneema frameless pack for lightweight overnighters.
Full details →Zpacks Bagger Ultra 25L Backpack
365 g
Ultralight day-hiking and short overnight pack in DCF. Minimalist design with padded back panel, sternum strap, and hip belt attachment.
Check price Full details →Zpacks Arc Scout 37L vs Zpacks Bagger Ultra 25L Backpack: which should you buy?
If saving weight is your priority, the Zpacks Bagger Ultra 25L Backpack wins — at 365 g it is 25 g (6%) lighter than the Zpacks Arc Scout 37L (390 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.