Design with bended W-shaped sides in combination with higher quality sheets (min. S355 and higher), which guarantee a min. 40% higher strength than ordinary steel. Robust top hem made of tube min. 114 x 6 mm, rear reinforcements made of high-strength sheets and other improvements guarantee high strength and long life. The various characteristics of the materials used make it possible to choose the ideal combination with regard to the economy of operation, the service life of the container and its price.