The invention relates to a container comprising fittings for gripping, handling and securing same, each of said fittings (8) being placed at a corner of the container in the non-deployed position of the container. According to the invention, in the non-deployed position, the container is formed by: a central case (1) having a longitudinal dimension and a transverse dimension, and two extension blocks (2, 3) connected to the central case (1), with at least part of the structure of the central case (1) and of the extension blocks (2, 3) being sealed. In the non-deployed position, the length or width of each of the extension blocks (2, 3) is greater than half the longitudinal or transverse dimension of the central case (1) respectively. The extension blocks (2, 3) can move between the non-deployed position, in which the blocks and the central case (1) are placed at least partially on top of one another, and a deployed position in which each block forms a longitudinal or transverse extension of the central case (1), the thus deployed assembly forming a floating structure having an increased loading surface.