Cooler

FIG. 1 is a front, top and left-side perspective view of a cooler showing my new design; FIG. 2 is a front view thereof; FIG. 3 is a rear view thereof; FIG. 4 is a top view thereof; FIG. 5 is a bottom view thereof; FIG. 6 is a right-side view thereof; FIG. 7 is a left-side view thereof; and, FIG. 8 is a front, top, and left-side perspective view thereof, shown in a state of use. The broken lines shown represent portions of the cooler and form no part of the claimed design.