A bag suitable for bicycle racks clip from the substrate and bicycle top tube phone bag. Characterized in that: as the clip has a base substrate, within the framework of its size adaptation of bike racks; the top surface of the substrate and the underside of the bag bolted or riveted,bike handlebar bag with mini iPad holder pressed against the underside of the bicycle rack in the top surface of the framework; projecting from the substrate side down two or more fixed leptospirosis, the other side is provided with one or more activities of leptospirosis, respectively, within the framework of the bicycle racks on both sides engaging, and hook the bottom surface.