now to the drawings it is seen that the box is constructed from three separate parts or blanks one of which is shown in fig1 and consists of bottom panel 1 and side walls 2 each of which has two integrally formed terminal flaps 3 or 4 on which the lateral edges of the end walls 5 are glued or are attached in any other suitable manner the part which constitutes the end walls shown in fig2 has a trapezoid shaped form and is connected with its longer base side e g by gluing with the inside surface of the corresponding terminal flaps 3 of bottom panel 1 the inclined side edges 9 of the end walls 5 are connected in the same manner with the terminal flaps 4 of the side walls 2 so that whenever the box is folded and assembled the lateral walls 4 are inclined upwardly and inwardly toward one another as is seen in fig3 in order for the upper edge 6 of the terminal flap 4 to coincide precisely with the upper edge of the part 5 of the front wall when the box is assembled said edge 6 of the terminal flap 4 extends outward at an angle u03b1 the angle u03b1 corresponds to the angle which forms the sloping edge 9 of the trapezoid like part 5 with respect to a vertical line in the same manner the terminal flaps 3 and 4 are separated by an angular notch 7 the opening of which is 90 u00b0 2 u03b1 so that during the joining together of the terminal flaps 3 4 behind the end panel 5 their adjoining edges meet as can.