The Tucano Urbano B-Four backpack measures 47 LX cm 30.5 DX cm 55 H with a capacity of 35 Litres. It is a watertight backpack convertible into a bag by placing the shoulder straps in a special mesh pocket on the back to avoid flapping. It can be secured to the vehicle by two elastic hooks. It has an outer tarpaulin construction with electro-welded seams. It also has an inner back and shoulder straps in no–sweat Aero 3D mesh. It also has a watertight rollable closure with a bayonet clasp, a water-resistant external pocket with WR zip, and an adjustable strap on the chest for maximum safety on two wheels.