The ornamental design for a container, as shown and described.
FIG. 1 is a perspective view showing a container of the present invention and illustrating a layout for advertising material on an interior panel of a lid for the container, wherein the line representations of the graphic material within the squares defining the layout are shown for illustrative purposes only;
FIG. 2 is a front view of the interior panel of the lid shown in FIG. 1; and,
FIG. 3 is a front view of an alternative layout for advertising material on the interior panel of the lid of the container, wherein the line representations of the graphic material within the squares defining the layout are shown for illustrative purposes only.