My elementary school was one of those that switched to the bagged milk in the 90s. It was a pretty radical change, warranting a puppet show to ease us into this eco-friendly future. I doubt I'll ever forget they (the puppets) only gave it one thumb up, since the other thumb had to cover the straw hole when you plunge it into the milk bag. We were, uh, more enthusiastic and regularly gave two thumbs up.