A shelving system comprising at least one back panel and at least one block element, the back panel comprises a substantially planar surface, and where the at least one block element is mounted on the back panel, wherein the back panel comprises at least two areas, a first area of the at least one back panel comprising protrusions; the protrusions being mutually identical and positioned on the planar surface in grid points of a regular two dimensional grid; and a second area of the at least one back panel comprises the at least one block element, the block element extending in a distance corresponding to one or multiple of a standard module size in a plane parallel to the planar surface of the back panel in two mutually perpendicular directions defined by grid points of a regular two dimensional grid.