box of 5 pieces or cavities made in plastic material , that comprises a base , greater and smaller walls , with or without upper covers , with hinged means that allow to lower the walls on the base in order to reduce the dimensions of the box and to adopt a storing position ; and with press fit means of easy manipulation that allow to lock the walls permitting the box to adopt an using position , and to unlock the walls to lower them on the base . in addition the box to the present invention comprises rigid male / female means , that can be flattened , arranged in their upper corners of the greater walls , that allow to flatten the male protrusions in order to give an improved security in the process of stacking of pallets on finished product pallets , avoiding with it the risks of lateral failings of columns boxes and whole pallets . besides , it provides more space in shelves in the market . also , the box comprises greater and smaller walls slightly widened towards its corners that gives to it an improved resistance to support the diverse loads and stresses which are exerted to the box when it is being used , specially the ones generated in the stacking .