We claim the ornamental design for a product container, as substantially shown and described.
FIG. 1 is an elevated perspective view of a product container of the present invention.
FIG. 2 is a level view of a front side of the product container of the present invention.
FIG. 3 is a level view of a rear side of the product container of the present invention.
FIG. 4 is a level view of a right side of the product container of the present invention.
FIG. 5 is a level view of a left side of the product container of the present invention.
FIG. 6 is a top plan view of a top side of the product container of the present invention; and,
FIG. 7 is a bottom-up view of a bottom side of the product container of the present invention.
The broken lines shown in the drawings are included for the purpose of illustrating portions of the product container and form no part of the claimed design.