This spacious pack is ideal for challenging multi-day alpine traverses by mountain bike. The clever layout, with tool and pump compartments, for instance, plus a handy front stash pocket which can also accommodate a helmet, plus a subdivided main compartment give this pack easy handling and clever organization. The deuter Airstripes back system allows air to flow across the back for good ventilation while creating a snug, solid fit for tackling challenging trail sections without load wobble. deuter - Trans Alpine 30l Bike Backpack black