The next step in the evolution of fun drinks for packed lunches. Rather than the boxes of waxed cardboard of yore, or the odd barrel-shaped plastic cylinders of bug juice, you have beautiful Mylar with wonderful, saliva-inducing graphics printed on both the front and the back, creating a shiny bladder of 10 percent real juice happiness. Beware of losing the straw; liquid extraction is a bit touch-and-go without it. Comes in many different flavors, all good.