ya, I want one of those

Now here is an invention that I need for my own personal use. This pic is from a Oaklandd A's night game. That, my fellow coffee drinking friends, is a man carrying a coffee keg (for lack of a better name). Yep, volumes of coffee strapped on his back in an insulated container. There is a hose that comes off it with a spout allowing him to serve up hot java right from his hip. While I am in awe of this tremendous invention, I am also a bit surprised that I didn't think of it.