Abstract: A flexible container for packaging solid particulate materials in bulk, includes a bottom (1), four substantially rectangular outer side walls (2) and a cap, characterized in that, inside the flexible container, a tube made of a flexible material and having a height lower than the height of the outer side walls is attached by vertical attachment lines (5) on the four outer side walls (2) of the vessel in order to define a central compartment (6) and four peripheral compartments separated from the central compartment by four inner walls (8a, 8b, 8c, 8d), respectively, each of the inner walls including a central pouring element (11) at the upper edge thereof.