FIG. 1 is a perspective view of the cap for a pouch showing our new design; FIG. 2 is a front elevational view thereof; FIG. 3 is a first side view thereof; FIG. 4 is a back view thereof; FIG. 5 is a second side view thereof; FIG. 6 is a top plan view thereof; and, FIG. 7 is a bottom plan view thereof.