The ornamental design for a “inflatable enclosure”, as shown and described.
FIG. 1 is a top perspective view of the inflatable enclosure, according to a first embodiment;
FIG. 2 is a front view thereof;
FIG. 3 is a side view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a is a top perspective view of thereof, according to a second embodiment;
FIG. 6 is a front view thereof
FIG. 7 is a side view of thereof; and,
FIG. 8 is a top view thereof.
The broken line showing of portions of the “inflatable enclosure” is included for the purpose of illustrating environmental structure and forms no part of the claimed design.