Hot selling square bottom building materials valve pocket PP woven bags are specialized bags that are perfect for storing, packing, and transporting building materials, such as cement, sand, and gravel. These bags are made of high-quality PP (polypropylene) woven material, which is sturdy, durable, and tear-resistant. Furthermore, they have a unique square bottom design, which provides increased stability, stackability, and storage capacity. The valve pocket design allows for easy filling and discharge of contents, making them ideal for use in construction sites, factories, warehouses, and other industrial applications. And the best part is, we are a factory that produces these bags, so you can be assured of their quality and affordable prices!