Abstract: A multi-compartment container includes a molded body and a molded cap secured thereto. The body includes a confining wall forming a space, an internal dividing wall forming separate compartments within the space, and a base. The interface between the dividing wall and an inner side surface of the body defines a fluid seal between the compartments. The dividing wall forms an opening at an upper end of the body which communicates with one of the compartments. The cap is secured to the upper end of the body to form a seal therearound. The cap includes a first port aligned with the opening in the dividing wall to form a passage therewith, and a second port communicating with the other compartment. A compressible endless seal ring is mounted in a groove in either the cap or the dividing wall to form a seal around the passage at the interface between the first port and the opening when the cap is installed onto the body portion.