System and method for connecting a concentrate container with a blood treatment device

A container for concentrate, comprising:

• a main body for containing concentrate, the main body having a longitudinal axis,
• a connection portion having a flat end surface and configured to connect the container to a blood treatment device, and defining a central opening,
• two attachment elements arranged at two opposing sides, respectively, of the connection portion and configured to reversibly attach the container to two corresponding device attachment elements present on the blood treatment device, and
• two connection elements formed through the connection portion, each of the two connection elements comprising an opening at the flat end surface of the connection portion, being in the form of a linear channel through the connection portion and that opens into the main body, and being configured to interact with two corresponding device connection elements present on the blood treatment device to fluidically couple the container with the blood treatment device by insertion of the two corresponding device connection elements present on the blood treatment device into the corresponding two connection elements of the container, wherein
• the two attachment elements project in a first direction and the two connection elements project in a second direction that is oriented essentially at a right angle to the first direction,
• the two attachment elements comprise a first attachment element and a second attachment element,
• the two connection elements comprise a first connection element and a second connection element, and
• the central opening, the two attachment elements, and the two connection elements are all aligned with one another.