Juice Cartons

I was drinking some juice today from a paper carton, when I realized that there is no reason for it to be made out of paper. The thing has a screw on, circular top. The whole point of the carton is that you open it by pulling apart the top to create an opening by which you can drink the juice. Obviously the new design is more effective at keeping my juice fresh, so why do they still pretend that it has to come in the cardboard container? It must be that people prefer the cardboard container out of habit- juice has always come in the container, so they still want it that way. Or perhaps the paper instills some sort of taste that plastic doesn't, and people have grown to like this taste.