The ornamental design for a containerset, as shown and described.
FIG. 1 is a first top perspective view of a container set, showing our new design.
FIG. 2 is a front elevation view of the container set of FIG. 1.
FIG. 3 is a back elevation view of the container set of FIG. 1.
FIG. 4 is a right-side elevation view of the container set of FIG. 1.
FIG. 5 is a left-side elevation view of the container set of FIG. 1.
FIG. 6 is a top plan view of the container set of FIG. 1.
FIG. 7 is a bottom plan view of the container set of FIG. 1; and,
FIG. 8 is a second top perspective view of the container set of FIG. 1.
The broken lines in the drawings depict portions of the container set that form no part of the claimed design. The dashed lined arrows form no part of the claimed design.