Abstract: An improved unibody bumper system including a concave back plate welded to the sheet metal of the unibody, to be integral therewith across the front and back of the automobile unibody and wrapped around on the sides. A pressurized, elongated bumper is secured to the back plate by fasteners at either of its sealed ends. The bumper member is formed by taking a length of hose or other flexible tube sized and shaped to conform to the concave back plate and sealing the ends by clamping the walls inward. A mastic-covered flat seal member is provided in the tube at the area of clamping. In a first embodiment, a C-shaped clamp member is bolted against the hose or tube end by a bolt which passes through a hole formed therein, which bolt also serves to secure the end of the bumper element to the backing plate. In a second embodiment, a short section of a close-fitting metal sleeve is placed over the tube and then pressed flat, the sleeve serving to thereafter clamp the walls of the tube end together.