The ornamental design for a containerlid, as shown and described.
FIG. 1 is an isometric view of my new design as incorporated onto a top surface of a container lid, the container lid sides being shown in dotted line as environmental structure, a bottom of the container lid being unadorned and forming no portion of the design;
FIG. 2 is an isometric view of my new design as shown in FIG. 1, taken from another angle;
FIG. 3 is a plan view of my new design shown in FIG. 1; and,
FIG. 4 is a cross sectional view of my new design taken substantially along Line 4-4 of FIG. 3.