The ornamental design for a packagingcontainer, as shown and described.
FIG. 1 is a perspective view of a packaging container showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is an exploded perspective view.
The broken lines in the drawings-are included for the purpose of illustrating portions of the packaging container design that form no part of the claimed design.