yous must be kidding a chillum isone of the most effective tools i carry as far as smokin bud is concerned. Dont know exactly what size but i use a socket from a set, the right size to sit on an anverage sized bottle lid, out a gauze in tape the outside and bobs your uncle. As long as ive got my chillum and a lighter i can find a bottle and fill it with water to smoke my green wherever, whenever:thumbsup: