Container and method for its manufacture

The present invention relates to a method for manufacturing a reservoir (1) comprising a main body (4) provided with several compartments (7), a base (6) closing the main body (4) in its lower part and a cover (5) closing the main body (4) in its upper part, said method comprising the following steps: - shaping sheets to produce constituent parts of the reservoir (1); - assembly by end-to-end welding of each of the constituent parts to produce the reservoir (1).