This one took quite a while to make. you take on of those little pumps for inflating like beds and stuff, then duct tape the inhaling part of it to a regular bong, (i used a homemade waterbong) the part that blows, tape a large garbage bag to it. the light the weed and turn on the pump. when the bags full, just inhale as much as you can at a time. Gets you right fucked