The ornamental design for a container, as shown and described.
FIG. 1 is a perspective view from front, above, and one side of the container;
FIG. 2 is a front view of the container;
FIG. 3 is a back view of the container;
FIG. 4 is a right side view of the container, the left side being a mirror image thereof;
FIG. 5 is a top view of the container;
FIG. 6 is an bottom view of the container; and,
FIG. 7 is a perspective view of the container in use condition with the lever pushed up and the lid in open condition.
The broken line showing of the denture adhesive strips within the container showing in FIG. 7 is for the purpose of illustrating environment and forms no part of the claimed design.