The ornamental design for a containerlid, as shown and described.
FIG. 1 is an elevated front perspective view of a container lid with a popcorn bucket shown in ghost for context, the bucket not being part of the container lid;
FIG. 2 is a top view of the container lid depicted in FIG. 1;
FIG. 3 is a front view of the container lid depicted in FIG. 1;
FIG. 4 is a back view of the container lid depicted in FIG. 1;
FIG. 5 is a side view of the container lid depicted in FIG. 1;
FIG. 6 is an opposing side view of the container lid depicted in FIG. 1 relative to the side view depicted in FIG. 5; and,
FIG. 7 is a bottom view of the container lid depicted in FIG. 1.
The broken line alphanumeric characters illustrate portions of the container lid which form no part of the claimed design.