Abstract: The invention relates to a dual-component container system (1) consisting of at least two containers (2, 3) for keeping separately substances which are used as a mixture. Said containers (2, 3) each have a mixing opening (5, 7) which can be closed by means of a sealing cap (6, 8), and are interconnected by means of a connecting piece (4) interacting with sealing caps (6, 8) with mixing openings (5, 7) facing each other At least one (6) of the sealing caps (6, 8) is connected to said connecting piece (4) by means of a clamping joint.