The ornamental design for a packingbox, as shown and described.
The file of this patent contains at least one drawing executed in color. Copies of this patent with color drawings will be provided by the Office upon request and payment of the necessary fee.
FIG. 1 is a perspective view of a packing box;
FIG. 2 is a front view of the packing box of FIG. 1;
FIG. 3 is a rear view of the packing box of FIG. 1;
FIG. 4 is a left-side view of the packing box of FIG. 1;
FIG. 5 is a right-side view of the packing box of FIG. 1;
FIG. 6 is a top plan view of the packing box of FIG. 1; and,
FIG. 7 is a bottom plan view of the packing box of FIG. 1.