Abstract: An improved container for fluid or semifluid materials has a prismatic rectangular shape determined by partition walls rigidly joined together by means of profiles and ties. The walls forming the top and the base of the container have longitudinal profiles joined alternatively to each other by means of resistant ties, defining a triangular structural framework reinforcing the structure of the container to prevent deformation or bulging thereof by internal pressure. In the preferred embodiment, the walls of the container are corrugated transversely. The corrugation of the top and the base walls is formed from over elevations or elongated cavities with rounded ends. The preferred embodiment further has cross-braces emerging from the top corners of the containers to define bending preventive reinforcement of the container.