i just finished making a 3 foot water bottle bong, took me like 2 hours with duck tape, and a glue gun to make it and get it air tight, its 5 water bottles put together, i treid it out and jesus i milked smoke half way up then carbed it, it hits you just like a normal 3 footer, and you milk the smoke all the way to the top and get a fuckin huge hit that will rape your lungs..crazy