Abstract: A convertible enclosure system includes a rigid structure covered by a flexible liner. The rigid structure includes an upper frame with a first side bar, a second side bar, a front bar, and a rear bar, and legs extending downward from the upper frame and terminating at foot ends. The front and rear bars are adjustable in length between a retracted length and an extended length. The flexible liner includes an upper member surrounding upper frame, a bottom member operably connected to foot ends of each of the legs, and a sidewall extending between the upper member and the bottom member. The flexible liner is configured to adjust in size as the length of the front bar and the length of the rear bar is adjusted.