The ornamental design for container pad, as shown and described.
FIG. 1 is a top front perspective view of a container pad.
FIG. 2 is another front perspective view thereof.
FIG. 3 is a bottom perspective view thereof.
FIG. 4 is a front elevation view thereof.
FIG. 5 is a rear elevation view thereof.
FIG. 6 is a right side elevation view thereof.
FIG. 7 is a left side elevation view thereof.
FIG. 8 is a plan view thereof.
FIG. 9 is a bottom view thereof; and,
FIG. 10 is a top perspective view of a container pad in use to support one corner of a container.
The partial container shown in broken lines are environmental subject matter included to depict how the claimed design may appear when used to support one corner of a container and form no part of the claimed design. The remaining broken line subject matter is unclaimed features.