I've done em. use a newspaper, bread, umbrella bag cause they are long and best fit a 2 liter bottle. make sure it is taped around the whole part where the bag touches the bottle to ensure air tightness. I prefer to use a waterfall over a bag basically the same thing just more effective.
Bongsmith Reviewed by Bongsmith on . smoking out of a "lung" has anyone ever made/smoked out of one of these? basically where you cut the bottom off of a soda bottle, tape a plastic bag to the bottom, then make a holder for the weed in the cap of the bottle. as you light you pull down on the bag sucking the smoke into the bottle, remove the cap, and push up on the bag as you inhale the smoke. this is obviously a cheap, quick way to smoke but im curious to see if anyone has made a good lung, and wether or not it has worked. Rating: 5