Timbuk2 Especial Viaje Pannier Converts from a pannier to a backpack. Ultimate on bike or on body bag. Converts to a backpack with comfort straps and hydration / headphone routing. Ripstop Cordura Nylon 6.7 Air jet textured for high abrasion resistance and exceptional strength to weight ratio. Internal welded laptop pocket for laptops up to 15" inches. Guaranteed waterproofing.