A push-over box made of cardboard, corrugated cardboard or another foldable flat material, comprising: - an inner part having a bottom wall and four first side walls, - an outer part having a top wall and four second side walls, - first locking tabs abutting the outsides of two opposing first side walls, connected to the inner part via folding lines, and forming first locking edges with their lower edges below the top wall, - second locking tabs abutting the insides of two opposing second side walls, connected to the outer part via folding lines, and forming second locking edges with their upper edges below the top wall, - wherein the first locking tabs comprise, at least at the first locking edges, two layers of the foldable flat material from which the inner part is formed, and/or the second locking tabs comprise, at least at the second locking edges, two layers of the foldable flat material from which the outer part is formed, - first engagement holes arranged in the two second side walls above the second locking edges and downwardly open second engagement holes arranged at the lower edge, - as a result of which, when the outer part is pushed onto the inner part, the second locking edges are arranged below the first locking edges, the first and second locking edges prevent the outer part and inner part from being pulled apart by contacting one another, by engaging the thumb and forefinger of the one hand in the first engagement openings and partially pressing the first locking tabs together, the outer part can be gripped and the contact between the first and second locking tabs can be prevented and by engaging the thumb and forefinger of the other hand in the second engagement openings, the inner part can be gripped and the outer part and inner part can be pulled apart. - an inner part having a bottom wall and four first side walls, - an outer part having a top wall and four second side walls, - first locking tabs abutting the outsides of two opposing first side walls, connected to the inner part via folding lines, and forming first locking edges with their lower edges below the top wall, - second locking tabs abutting the insides of two opposing second side walls, connected to the outer part via folding lines, and forming second locking edges with their upper edges below the top wall, - wherein the first locking tabs comprise, at least at the first locking edges, two layers of the foldable flat material from which the inner part is formed, and/or the second locking tabs comprise, at least at the second locking edges, two layers of the foldable flat material from which the outer part is formed, - first engagement holes arranged in the two second side walls above the second locking edges and downwardly open second engagement holes arranged at the lower edge, - as a result of which, when the outer part is pushed onto the inner part, the second locking edges are arranged below the first locking edges, the first and second locking edges prevent the outer part and inner part from being pulled apart by contacting one another, by engaging the thumb and forefinger of the one hand in the first engagement openings and partially pressing the first locking tabs together, the outer part can be gripped and the contact between the first and second locking tabs can be prevented and by engaging the thumb and forefinger of the other hand in the second engagement openings, the inner part can be gripped and the outer part and inner part can be pulled apart.