When first introduced, the McDonald’s clamshell appeared to be the ideal packaging for a fast-food hamburger. The polystyrene-foam box not only kept the heat and moisture in but also absorbed neatly any errant grease. Furthermore, the hamburger could be boxed in one quick flip of the lid and opened just as easily. Unfortunately, what was once heralded as a brilliant price of packaging because such an environmental nightmare for the restaurant chain that it reverted to paper packaging.