One reason I like waterfalls is because you can pack small bowls, and get messed up with one or 2 hits. For me, it's also very stealthy. I use a bottlecap with a socket and screen, and carry it everywhere. It's easy to hide if your being searched too. When I went to see 300, I brought the cap, a lighter, and bottle of water for "the movie". My rents thought nothing of it. I cleared the 8 oz bottle, went inside, and had soooo much fun. Also, if you don't use up the whole bowl with one fill and you cant get more water, smoke the rest like a pipe.