U.S. Quidditch is the governing body for the sport. https://www.usquidditch.org/
According to the official rules, the Snitch is, "… a runner dressed in yellow with a velcro tail attached to their shorts."
Quaffles are volleyballs (of course) and Bludgers are dodgeballs. Players run about the field holding a length of plastic pipe between their legs for the broomstick.