A few weeks ago, I broke my bong. It was a sad, sad day. However, Ive got an empty coke bottle. Let just play with that and see what happens. Sucess! Only now... I have the itch, to expand. I also happen to drink Coke like a fiend, so I start collecting bottles. As I collect more, I add. The end/mouthpiece is actually a 20oz bottle with super long hose so you can fill it up then sit back on the couch and take small rips off whats in there. Its fantastic! The best part is, the way i designed it, i can just unscrew the main piece with the slide, and use it as a normal bong. Just wanted to share.