A cartridge includes a printing material supply port which is configured and arranged to be connected to a printing material supply pipe provided in a printing device. An effective area T of the printing material supply port is the same or more and five times or less than an effective area S of the printing material supply pipe. The effective area T may be set as two times or more and is 4.5 times or less than the effective area S. The effective area T may be set as three times or more and is four times or less than the effective area S.