The Caboose is compact, a mere 2.5" tall when closed, and 4" tall when ready for use. It is 8" x 10" and weighs just under a pound. There is room to store a diaper when closed. Any size diaper works in the potty.  If you don't have any diapers, you can still use the potty, although that defeats the genius of the Caboose. The carrying bag has a sturdy handle, it zips open quickly and has a small fabric insert to ward off odors.