A mounting system (100, 200) for a flat product, in particular a respective bendable artwork (50, 51), the mounting system comprising a continuous base structure having an upper side and a lower side opposite the upper side, and comprising: - a polygonal central portion (10, 10') comprising at the upper side a polygonal supporting area for a viewing portion of the flat product (50, 51), and at least one inner fold line for folding the central portion (10, 10'), the supporting area being defined by first peripheral fold lines of the base structure, and the at least one inner fold line at least substantially extending between two of the first peripheral fold lines; and - edge strips, each of the edge strips being foldably connected to the central portion (10, 10') along one of the first peripheral fold lines, comprising second peripheral fold lines which are parallel to the one of the first peripheral fold lines, comprising, at the upper side, an inner fixing area for the flat product and an outer area, and each of the edge strips being foldable into a three-dimensional perimeter member, so that the outer area is arranged opposite the lower side of the central portion (10, 10') and fixable with respect to the central portion (10, 10') by means of a locking system or so that the outer area is fixable with respect to the lower side of the central portion (10, 10') by means of a locking system (E, F, O), the locking system (E, F, O) comprising an opening in the edge strip folded into the three-dimensional peripheral element and a fixing element which can be out-folded from the polygonal central portion (10, 10') and can be partially inserted into the opening, and/or wherein the central portion (10, 10') comprises a corner fastening element that can be fold out and comprises two end portions partially insertable into respective openings of two adjacent edge strips when folded into a respective three-dimensional peripheral element, the corner fastening element being foldable along a fold line (e) of the corner fastening element, and the corner fastening element being configured to at least contribute to fixing the outer portions of the adjacent three-dimensional peripheral elements. - a polygonal central portion (10, 10') comprising at the upper side a polygonal supporting area for a viewing portion of the flat product (50, 51), and at least one inner fold line for folding the central portion (10, 10'), the supporting area being defined by first peripheral fold lines of the base structure, and the at least one inner fold line at least substantially extending between two of the first peripheral fold lines; and - edge strips, each of the edge strips being foldably connected to the central portion (10, 10') along one of the first peripheral fold lines, comprising second peripheral fold lines which are parallel to the one of the first peripheral fold lines, comprising, at the upper side, an inner fixing area for the flat product and an outer area, and each of the edge strips being foldable into a three-dimensional perimeter member, so that the outer area is arranged opposite the lower side of the central portion (10, 10') and fixable with respect to the central portion (10, 10') by means of a locking system or so that the outer area is fixable with respect to the lower side of the central portion (10, 10') by means of a locking system (E, F, O), the locking system (E, F, O) comprising an opening in the edge strip folded into the three-dimensional peripheral element and a fixing element which can be out-folded from the polygonal central portion (10, 10') and can be partially inserted into the opening, and/or wherein the central portion (10, 10') comprises a corner fastening element that can be fold out and comprises two end portions partially insertable into respective openings of two adjacent edge strips when folded into a respective three-dimensional peripheral element, the corner fastening element being foldable along a fold line (e) of the corner fastening element, and the corner fastening element being configured to at least contribute to fixing the outer portions of the adjacent three-dimensional peripheral elements. so that the outer area is arranged opposite the lower side of the central portion (10, 10') and fixable with respect to the central portion (10, 10') by means of a locking system or so that the outer area is fixable with respect to the lower side of the central portion (10, 10') by means of a locking system (E, F, O), the locking system (E, F, O) comprising an opening in the edge strip folded into the three-dimensional peripheral element and a fixing element which can be out-folded from the polygonal central portion (10, 10') and can be partially inserted into the opening, and/or wherein the central portion (10, 10') comprises a corner fastening element that can be fold out and comprises two end portions partially insertable into respective openings of two adjacent edge strips when folded into a respective three-dimensional peripheral element, the corner fastening element being foldable along a fold line (e) of the corner fastening element, and the corner fastening element being configured to at least contribute to fixing the outer portions of the adjacent three-dimensional peripheral elements.