The ornamental design for an inflatableobject, as shown and described.
FIG. 1 is a perspective view of an inflated inflatable object showing our new design;
FIG. 2 is a front view of the inflated inflatable object;
FIG. 3 is a rear view the inflated inflatable object;
FIG. 4 is a side view of the inflated inflatable object;
FIG. 5 is a side view of the inflated inflatable object;
FIG. 6 is a top view of the inflated inflatable object; and,
FIG. 7 is a bottom view of the inflated inflatable object.
The broken lines in the drawings showing elements of the inflated inflatable object represent unclaimed portions of the inflatable object and form no part of the claimed design.