The Proof 28 combines the best of both worlds! You start your new mountain adventure on a bike and need a slim, flexible backpack. Then, you tackle a challenging route towards the summit – robust equipment is essential, capable of withstanding rough treatment. The Proof 28 delivers all 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 trekking poles. Just as you need it. A reliable waterproof roll closure ensures quick access to the main compartment, making the backpack a true all-rounder 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 from 64% recycled Econyl. The Proof 28 is environmentally friendly and is waterproof welded using high-frequency technology at the company's location in Germany.