The ornamental design for the container label, shown and described.
FIG. 1 is a front elevational view of the container label according to the present invention;
FIG. 2 is a side elevational view of the container label according FIG. 1, the opposite side view being identical thereto; and,
FIG. 3 is a perspective view of the container label according to FIG. 1.
The broken line structure shown in the drawings, which depicts a representative container in the form of a test tube, is for environmental purposes only and forms no part of the claimed design.