The Proof 28 combines the best of both worlds! You start your new downhill adventure on a bike and need a slim, flexible backpack. Then, you head towards the summit on a challenging route - robust equipment is necessary that can withstand rougher treatment. The Proof 28 delivers all of this and much more. This solid bike & hike backpack features a flexible, movement-friendly EMP back panel. Particularly practical is the detachable outer pocket for GPS, maps, or other items that need to be quickly accessible; alternatively, a cord spider can be attached to hold additional accessories like a helmet, jacket, or poles. Just as you need it. A reliable waterproof roll closure ensures quick access to the main compartment, making the backpack a true multi-talent in terms of versatility, weather resistance, and packing volume. More highlights come at the end: the extremely abrasion-resistant, bluesign®-certified main material is made of 64% recycled Econyl. The Proof 28 is environmentally friendly and waterproof welded using high-frequency technology at the company’s location in Germany.