A collapsible superstructure for a pallet, wherein the superstructure comprises: four corner profiles arranged to, in a raised position of the superstructure, be placed standing upright, in a vertical direction, at each corner of said pallet, a first pair of opposite side walls of the superstructure, which side walls are each provided with at least one inner hinge joint connecting two portions (11a, 11b) of the side wall wherein the two portions of the side wall are arranged side by side on both sides of the inner hinge joint, wherein the inner hinge joint is standing upright in the vertical direction, and which side walls are each connected to two corner profiles, a second pair, separate from said first pair, of opposite side walls (12a, 12b) of the superstructure, which side walls (12a, 12b) are each connected to two corner profiles, wherein, at each one of the corner profiles, at least one of the side walls connected to the respective corner profile is connected via upright standing hinge joints for permitting collapse of the superstructure, wherein at least one of the side walls in said first pair of opposite side walls or in said second pair of opposite side walls is provided with an openable portion in an opening, wherein the openable portion is formed by one or more plates, and the openable portion is provided with stiffening folds that extend in the horizontal direction along said side wall provided with the opening, characterized in that the stiffening folds in the horizontal direction extend across the whole of the openable portion, that the openable portion comprises first, second, third and fourth abutment portions (A, B, C, D) located at a respective corner of the openable portion, wherein the first and second abutment portions are diagonally opposite each other, wherein the third and fourth abutment portions are diagonally opposite each other, that the first abutment portion and the third abutment portion are arranged to abut directly or indirectly on one of the corner profiles connected to the side wall provided with the opening, and that the second abutment portion and the fourth abutment portion are arranged to abut directly or indirectly on the other of the corner profiles connected to the side wall provided with the opening, whereby a unidirectional angle setting of the two corner profiles, connected to the side wall provided with the opening, along said side wall provided with the opening, is counteracted. four corner profiles arranged to, in a raised position of the superstructure, be placed standing upright, in a vertical direction, at each corner of said pallet, a first pair of opposite side walls of the superstructure, which side walls are each provided with at least one inner hinge joint connecting two portions (11a, 11b) of the side wall wherein the two portions of the side wall are arranged side by side on both sides of the inner hinge joint, wherein the inner hinge joint is standing upright in the vertical direction, and which side walls are each connected to two corner profiles, a second pair, separate from said first pair, of opposite side walls (12a, 12b) of the superstructure, which side walls (12a, 12b) are each connected to two corner profiles, wherein, at each one of the corner profiles, at least one of the side walls connected to the respective corner profile is connected via upright standing hinge joints for permitting collapse of the superstructure, wherein at least one of the side walls in said first pair of opposite side walls or in said second pair of opposite side walls is provided with an openable portion in an opening, wherein the openable portion is formed by one or more plates, and the openable portion is provided with stiffening folds that extend in the horizontal direction along said side wall provided with the opening, characterized in that the stiffening folds in the horizontal direction extend across the whole of the openable portion, that the openable portion comprises first, second, third and fourth abutment portions (A, B, C, D) located at a respective corner of the openable portion, wherein the first and second abutment portions are diagonally opposite each other, wherein the third and fourth abutment portions are diagonally opposite each other, that the first abutment portion and the third abutment portion are arranged to abut directly or indirectly on one of the corner profiles connected to the side wall provided with the opening, and that the second abutment portion and the fourth abutment portion are arranged to abut directly or indirectly on the other of the corner profiles connected to the side wall provided with the opening, whereby a unidirectional angle setting of the two corner profiles, connected to the side wall provided with the opening, along said side wall provided with the opening, is counteracted.