The ornamental design for a packagingcontainer, as shown and described.
FIG. 1 is a top, front, right perspective view of a packaging container showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is bottom perspective view thereof.
The even-length broken lines within the claimed region are claimed partial cuts in the packaging container. The uneven-length broken lines showing the remainder of the packaging container are for environmental purposes only and form no part of the claimed design.