The present application describes a box and its self-assembling method. The box is obtained from a sheet of material comprising a crease at a distance of half width of the box from the lower small end (1), a crease at a distance of one height plus half width of the box from the lower smaller end (2), a crease at a distance of one height plus one and a half width of the box from the lower smaller end (3), a crease at a distance of twice the height plus one and a half width of the box from the lower smaller end (4), a crease at a distance equal to one height of the box from the larger left end (5), a crease at a distance equal to one height plus one length of the box from the larger left end (6), diagonal creases (7) and sticking points (8).