The ornamental design for a containmentmat, as shown and described.
The patent file contains at least one drawing in executed in color.
FIG. 1 is a perspective view of a containment mat showing my new design;
FIG. 2 is a side view of the design in FIG. 1; all sides are the same;
FIG. 3 is a top view of the design in FIG. 1; and,
FIG. 4 is a bottom view of the design in FIG. 1.
The containment mat is shown with jagged lines to indicate non-specified length. The appearance and any portion of the article between the jagged lines forms no part of the claimed design.
The broken lines form no part of the claimed design.