Biaxially Orientated Polypropylene. BOPP is stretched in both the machine direction and across machine direction for fast and smooth processing on high speed and other machines. Due to its superior strength at low gauges, flatness, clarity and excellent printability, this film is used for most Form Fill and Seal applications. It is available in a variety of thicknesses and sizes. The most common applications are for shrink-wrapping crackers, candies, chips, vitamin packs, CD's, and video games.