Trailer-type container (3) transformable into a sailing vessel and comprising a hollow cavity formed by two modules (8, 9) which, when joined by hinges (10) at one side, are capable of being superposed on one another to form a container (3), whereas when they are opened out the two edges without hinges coincide and are joined and converted into a vessel. To facilitate transport, the container can be coupled to the platform (2) of a trailer (1).