A multi-chamber container includes a medical bag made of a flexible film for storing medicines, and an outlet port mounted to the bag for discharging medicines. The bag has partition wall dividing the bag into compartments for medicines, the wall has welded portion separated by pressing to the bag, the port has extended portion extending to inside the bag and closure member integral with the port and having U-shaped profile, the member has sealed point connected to the bag such that the member is opened by expansion of the bag when the wall separates, the extended portion has recess and thin wall portion connecting to the member, the thin wall portion is broken by the expansion of the bag such that the member is pulled by the sealed point, hinges at the recess and is opened, and the sealed point is positioned away from the recess and toward the wall.
