i dont know if this has been done before but one of my friends made it and i thought it was nifty. the only bad thing is that it requires tinfoil regardless i thought it was cool and i wanted to share. what you do is put a bit of tinfoil on the mouth of the bottle and pull the bag out slowly while lighting the herb, then when done drawing the smoke, remove the bowl and inhale the smoke.
Yea this is called a lung or bag grav, replace the tin foil with a cap with a socket in it instead, much healthier for you and a better,studier bowl.
