Blank for a rack

A blank in the form of a starting plate which can be folded into a rack with sides and shelves, said starting plate made of a permanently deformable material and formed with side elements and shelf elements connected each along one side to a remainder of the starting plate by a bending region in the form of a number of segments and openings, while at least one remaining side of each side element and each shelf element is free, whereby the rack is folded by bending the side elements and the shelf elements about their respective bending regions so that the side elements become the sides of the rack and the shelf elements become the shelves, each shelf being formed as a cantilevered bar restrained in its associated bending region, wherein the bending regions of the shelf elements are upper bending regions as seen in the upright position of the rack while restraining a rear edge element that includes a plurality of rear edge sections, and wherein the bending region belonging to each shelf is designed with a moment of resistance which is equal to or larger than a bending moment which the bending region is influenced by when the shelf is loaded with a predetermined maximal load divided by the maximum allowed specific strain for the material concerned, wherein each side element includes a flap separated from the remainder of the starting plate by a slit whereby when the starting plate is folded into a rack the flaps extend from the remainder of the starting plate in a direction opposite the shelf elements and a remainder of the side elements for support against a surface for the rack.