Blue Double Zong Shape Glass Water Pipe With Bowl Blue Double Zong Shape Glass Water Pipe With Bowl 8 Inches Zong Bong Zongs are bongs with zigzag-shaped tubes that are fashionable, offer additional room to chill smoke down, and prevent water splashback. A zong bong may feature one, two, three, or more "zongs," each of which increases the amount of space available for cooling smoke.