Abstract: A system for shipping liquids is disclosed which comprises a container (12) which consists of two identical shells (16) the upper one of which is inverted with respect to the lower one. Toggles (32) and latches (34) are provided for pulling the two shells (16) together. The container rests on a frame, which includes pipework (44) for connecting to an inlet/outlet (26.1) in the base of the lower shell of the container. The equivalent inlet/outlet in the top of the upper shell of the container receives a gas escape vent (52). A flexible tank (46) is provided in the container (12) and the inlets/outlets communicate with the interior of the bag. The frame can, instead of accommodating just one container, be configured to support two, three or more containers in a side-by-side array.