HDPE/PP BagsHigh Density Polyethylene/Polypropylene Plastic Bags Production. Most Profitable BusinessOpportunities of StartupsWoven polypropylene bags, also known as woven PPbags, are the toughest packing bags available, and are commonly used to packmaterials for the grain, milling, and sugar industries. Furthermore, these bagsare commonly used in the fodder, pesticides, and fertilizer industries, as wellas the cement industry and other applications such as sand, metal parts, andconcrete.