It stands for Biaxially Oriented Polypropylene. This works as an additional layer to woven polypropylene bags.
The material is such that it allows custom, clear and vivid printing on both the sides of the bag.
It is an ideal polypropylene film that is used for packaging, labelling and graphic applications. It is also used for material that requires moisture resistance, optical clarity and high tensile strength such as food, cattle feed, grain & pulses packaging.