The ornamental design for an inflatableshield, substantially as shown and described.
FIG. 1 is a bottom, front and right side perspective view of an inflatable shield, showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The thick broken lines circles around the handles show stitching, and form no part of the claimed design. All other thinner broken lines illustrate portions of the inflatable shield, which form no part of the claimed design.