The ornamental design for a containercap, as shown and described.
FIG. 1 is a top perspective view of a container cap showing the new design;
FIG. 2 is a bottom perspective view thereof; FIG. 3 is an elevational view
thereof; FIG. 4 is a top plan view thereof; FIG. 5 is a bottom plan view
thereof; FIG. 6 is a bottom perspective view of an alternative embodiment;
and, FIG. 7 is a bottom plan view of the FIG. 6 embodiment. The views not
shown in the second embodiment of FIGS. 6 and 7 are identical to those of
the first embodiment shown in FIGS. 1-5.