one night i used a 2 liter as the chamber and cut a hole about halfway down. i cut a hole in the bottom of a half liter (16.9oz) water bottle and stuck a straw connecting the 2 liter and half liter. i screwed a bowl onto the half liter and filled it with some green and ripped hits out of the mouth of the 2 liter.

since then i've also moved onto glass