The ornamental design for a containerlid, as shown and described.
FIG. 1 is a top perspective view of a container lid, showing our new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left elevation view thereof;
FIG. 6 is a right elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The lid retention features, front extrusion feature, and top extrusion and relief features shown in broken lines are unclaimed environment, and form no part of the claimed design.