The ornamental design for a container, as shown and described.
FIG. 1 is a perspective view of a container showing my new design;
FIG. 2 is a front side elevational view thereof;
FIG. 3 is a rear side elevational view thereof;
FIG. 4 is a right side elevational view thereof, with the left side elevational view being a mirror image thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The broken lines including the areas within the broken lines in FIG. 3 and the unshaded areas around the lock in FIG. 2 depict portions of the container that form no part of the claimed design. In FIG. 6, the broken lines and the areas within the broken lines adjacent to the four angled feet drawn in solid lines depict portions of the container that form no part of the claimed design.