Tool for producing a container composed of plastic in a thermoforming process, in particular a plastic deep-drawing process, with a positive mould, comprising - a base section for forming a container base, - a side-wall section for forming a circumferential side wall which is formed to be of the same material as the container base, - a wall for forming a stacking edge which is in the form of a hollow profile and which projects beyond an outer contour of the side wall of the container in a manner running around an entire container outer side and which, inwardly towards a container inner side, is in the form of an open groove and which is arranged spaced apart from the container base, wherein - the wall, in a moulding position for moulding of the container, is arranged so as to protrude in a manner running around an entire outer side of the positive mould, and an angle (α) of less than 90° is formed between a wall side directed towards the base section and a region, extending from this wall side in the direction of the base section, of the associated side-wall section, characterized in that: - the wall is movable from the moulding position into a demoulding position, in which a distance (d) of an end, protruding in the moulding position, of the wall from the side-wall section is reduced, - the wall comprises multiple wall segments (14.1 to 14.n) which are each arranged in a pivotable manner on the side-wall section, - a movement of the wall segments (14.1 to 14.n) in the moulding position is blocked in the moulding direction, which extends from the base section along the side-wall section, and is enabled in the demoulding direction (-Y), which extends counter to the moulding direction, and - the region is of circumferential form and, in the moulding position of the wall segments (14.1 to 14.n), bears on the latter. - a base section for forming a container base, - a side-wall section for forming a circumferential side wall which is formed to be of the same material as the container base, - a wall for forming a stacking edge which is in the form of a hollow profile and which projects beyond an outer contour of the side wall of the container in a manner running around an entire container outer side and which, inwardly towards a container inner side, is in the form of an open groove and which is arranged spaced apart from the container base, wherein - the wall, in a moulding position for moulding of the container, is arranged so as to protrude in a manner running around an entire outer side of the positive mould, and an angle (α) of less than 90° is formed between a wall side directed towards the base section and a region, extending from this wall side in the direction of the base section, of the associated side-wall section, characterized in that: - the wall is movable from the moulding position into a demoulding position, in which a distance (d) of an end, protruding in the moulding position, of the wall from the side-wall section is reduced, - the wall comprises multiple wall segments (14.1 to 14.n) which are each arranged in a pivotable manner on the side-wall section, - a movement of the wall segments (14.1 to 14.n) in the moulding position is blocked in the moulding direction, which extends from the base section along the side-wall section, and is enabled in the demoulding direction (-Y), which extends counter to the moulding direction, and - the region is of circumferential form and, in the moulding position of the wall segments (14.1 to 14.n), bears on the latter. - the wall is movable from the moulding position into a demoulding position, in which a distance (d) of an end, protruding in the moulding position, of the wall from the side-wall section is reduced, - the wall comprises multiple wall segments (14.1 to 14.n) which are each arranged in a pivotable manner on the side-wall section, - a movement of the wall segments (14.1 to 14.n) in the moulding position is blocked in the moulding direction, which extends from the base section along the side-wall section, and is enabled in the demoulding direction (-Y), which extends counter to the moulding direction, and - the region is of circumferential form and, in the moulding position of the wall segments (14.1 to 14.n), bears on the latter.