The Proof 28 combines the best of both worlds! You set off on a new mountain adventure by bike and need a slim-fitting, flexible backpack. Then you head towards the summit on a challenging route - you need robust equipment that can withstand rough treatment. The Proof 28 does all of this - and much more. The solid bike & hike backpack has a flexible, movement-friendly EMP back panel. The removable outer pocket for GPS, maps or other things that need to be quickly to hand is particularly practical; alternatively, a cord spider can be attached to which additional accessories such as a helmet, jacket or poles can be attached. Just as you need them. The tried and tested waterproof roll closure ensures quick access to the main compartment, making the backpack a real all-rounder in terms of area of ​​use, weather resistance and packing volume. Further highlights come at the very end: The extremely abrasion-resistant, bluesign®-certified main material consists of 64% recycled Econyl. The Proof 28 is welded waterproof using high-frequency technology at the company's location in Germany in an environmentally friendly manner.