Filled with four riders or stuffed with gear, the Space Shuttle is simply huge. It measures 80 inches by 80 inches — get this — deflated. And it's ultra tough. The tube itself is 30-gauge vinyl with an inflatable cushioned floor. Covering the tube is 840 Denier double-coated nylon with a rear mesh drain vent and a double-reinforced towing harness. A heavy-duty Kwik-Connect makes for easy hook-ups.

There are eight handles for the four-rider Space Shuttle MTC. A cargo net for keeping gear in place is included.