A storage device comprising one or more grid-like basic components and at least one additional component releasably fixed thereto, the basic component being a grating having openings arranged in a single row or in a plurality of rows, the openings being defined by webs extending substantially perpendicular to the plane of the grating, the grating being provided with a frame or partial frame the rear side of which has spacing formations extending rearwardly beyond the plane of the grating, each said additional component having one or more anchoring elements which snugly engage in one or more of the said openings of the grating whereby to retain the said additional component in a mounted position on the grating.