The invention relates to a protective cover (10) with a base, two side walls (20), a front wall, a rear wall and a lid, wherein the protective cover (10) comprises a blank (12) which is formed integrally and is composed of a plastics material. The blank (12) has a base region (24′), a rear wall region (18′), a front wall region (16′), two side wall regions (20′) and a lid region (22′), and the blank (12) is folded in a cuboidal shape. Furthermore, it is provided that the protective cover (10) has connecting elements (14) with magnetic elements and optionally counter elements, wherein the connecting elements (14) are designed and arranged in such a manner that the edges of the blank (12) that butt against one another in the folded cuboidal shape are held together by the connecting elements (14) which exert magnetic attraction forces on one another.Furthermore, the invention relates to a folding sheet (11) which can be folded to form such a protective cover (10).