The ornamental design for a packagingcontainer, as shown and described.
1. Packaging container
1.1: Perspective
1.2: Open State Perspective view
1.3: Front
1.4: Back
1.5: Top
1.6: Bottom
1.7: Right Side view
1.8: Sectional view along line A-A
The broken lines in the drawings illustrate portions of the packaging container and form no part of the claimed design; the reproduction 1.8is a reduced-scale cross-sectional view along the line A-A in the reproduction 1.2; the left side view is omitted because it is a mirror image of the right side view.