The object of the invention is a modular donut for mounting on the site of its intended installation. The bucket shall consist of at least four basic components selected from a group comprising at least a side wall,the end wall,bottom component, vertical stiffening element, horizontal stiffening element horizontal, cross-section stiffening element horizontal and internal longitudinal angle. The basic components are in different variants due to different parameters, including at least height,length,width,the shape of the vertical cross-section, the shape of the cross-section or the cross-sectional dimension, and are selected from that group in their respective mentioned variants and numbers and are configured accordingly t o form at least one module in its appropriate variant and to create a dedicated message board final shape and dimensions. Each module is selected from a group comprising at least the longitudinal module (I),corner module (II),branching module (III),the end module (IV) and the branching module, and it also appears in these variants differentiated by different parameters, including at least height,length,width,vertical cross-section shape, absence or presence of at least one bottom component, incomplete bottom without or with an internal longitudinal angle. The basic components shall be so designed that they are directly interconnected with each other by technical means of interconnection, which are configured to cooperate with each other and all of which are completely within the enclosure of the assembled container. The bottom of the doughnut is divided along the side walls. Each of the walls of the mounted ladle i n the cross-section is essentially uniform and continuous.Przedmiotem wynalazku jest donica modułowa do montażu na miejscu jej docelowego posadowienia. Donica jest składana z co najmniej czterech podstawowych elementów składowych wybranych z grupy obejmującej co najmniej ścianę boczną, ścianę końcową, element składowy dna, element usztyw
