so ya, im bored so i took a 2leter siera mst bittle cut off the bottom, put a 12mm hole in the cap, put in my bowl from my bong with the rubber o ring, and this shit rips so nasty. the seal is perfect the amount and thickness of smoke is superiour to other methods of making a gb.
Gb's are awesome, the other day when me and some of my friends had nothing else, we made one out of a water cooler, and a milkjug, it hit so hard.