An ink cartridge for an inkjet printer includes a bottom face and a front face; interfaces on the front face for connection to a cartridge receiving structure, the interfaces including an ink interface; a guide interface in the bottom face for guiding the cartridge along a straight line during insertion in the cartridge receiving structure for connecting the interfaces, where the guide interface comprises a guide track for guiding a T-rail guide of the cartridge receiving structure, said guide track extending parallel to said straight line; and a latch track and a latch strop disposed in the bottom face of the ink cartridge to guide and retain, respectively, a latch of the cartridge receiving structure. The guide track and the latch track are formed by one integral cut out in the bottom face of the cartridge.