Inflatable Device

FIG. 1 is a top, front, right-side perspective view of an inflatable device; FIG. 2 is a bottom, back, left-side perspective view thereof; FIG. 3 is a front view thereof; FIG. 4 is a back view thereof; FIG. 5 is a left-side view thereof; FIG. 6 is a right-side view thereof; FIG. 7 is a top view thereof; and, FIG. 8 is a bottom view thereof. The dashed broken lines depict portions of the inflatable device that form no part of the claimed design. The dot-dashed broken lines represent boundaries of the claimed design and form no part of the claimed design.