BrainBank: Oh Man This Is What I've Always Dreamed of Edition

Oh man, a portable way to keep my watermelon cool? This is the best thing since sliced bread, or possibly the sliced bread cooler. Naturally this is a Japanese product, since only the Japanese would look at a watermelon and think "this needs an invention dedication to its well-being and preservation."

I wonder what else you could store in a watermelon cooler? The possibilities are endless.