FIG. 1 is a top isometric view of an overcap according to the present invention;

FIG. 2 is a side elevational view of a first side of the overcap of FIG. 1;

FIG. 3 is a side elevational view of a second side of the overcap of FIG. 1, the second side being opposite the first side;

FIG. 4 is a side elevational view of a third side of the overcap of FIG. 1;

FIG. 5 is a side elevational view of a fourth side of the overcap of FIG. 1, the fourth side being opposite the third side;

FIG. 6 is a top plan view of the overcap of FIG. 1; and,

FIG. 7 is a bottom elevational view of the overcap of FIG. 1.

FIG. 7 is provided for context only and form no part of the claimed design. Further, structure shown in phantom forms no part of the claimed design.