Abstract: Disclosed herein is a one piece box that tips back to open and is formed out of one single faced cardboard blank of a conventional aspect and parallelepiped shape comprising, in the closed position, two shells, the open parts of which face each other on opposite sides and are joined on the median longitudinal axis of a base wall, common to both, which, through simple deformation of the material along the said axis, constitutes the main rotation pivot for opening the box.