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This bong is called the Gravity Bong. Cut a 3 liter at the top of the label, and a 2 liter at the bottom of the label. Fill the 3 liter 3/4 the way with water. slide the 2 liter into the 3 liter. burn a small hole in the upper side of the 2 liter. make a hole in the cap and melt it a little bit with a lighter. insert a type f cable connector, the screw on type, and let it sit for a minute to seal air tight. roll a bowl up and pack it into the cable connector. place a finger over the small hole you burnt and slowly pull up on the 2 liter while burning the bowl. When you are ready to hit the bong, carefully take off the cap, not allowing much smoke to leak out and put your mouth on the hole and go down with it. I guarantee if you have some good grass, 1 hit and you will be high. High but not yet stoned.

Never heard of one of them before

Interesting bong, but I can't think of any drinks that are sold in 3 litres.

Sounds like a good bong becuase gravity bongs always get me Fwucked Up. But I would have to say that a Sobe bottle is the best for a good gravity bong.

ive seen that done with a 2ltr and a 1ltr pepsi bottle