The Rifton HTS Portability Base with Carry Bag lets you take this system with you anywhere you want to go. The Carry Bag fits the Rifton HTS Portability Base, Seat & Back, Armrests, and other accessories. The to halves of the Portability Base Frame click together to provide a secure base to place the Rifton HTS seating system. The Rifton HTS Portability Base & Carry Bag provide consistency and cleanliness for toileting when you are away from home. The Rifton Portability Base fits both the Small & Medium Rifton HTS seats.