LOL yes I have heard of those and basically they're for women who are on long distance car rides and not near a service station. I wonder if they're disposable or plastic, to be emptied and used again. If it's the latter - this would create another problem of - you would have to rinse it and then where do you store it for next time...yikes....another germophobic nightmare lol. You wouldn't want to put it in your back pack lol.