The ornamental design for product packaging, as shown and described.
FIG. 1 is a perspective view of a product packaging showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a top view thereof; and,
FIG. 6 is a bottom view thereof.
The broken line showing of various regions, the unshaded portions therein, and the remainder of the product packaging is for illustrative purposes only and forms no part of the claimed design.