These bags are made from woven polypropylene, often with options for liners to improve moisture resistance. They include lifting loops for forklifts, spout or open top/bottom designs for filling/emptying, and are built to handle large weights (1,000-2,500 lb) or more. Good for farm storage of dry bulk goods like grain or fertilizer, and transporting between fields or to processors. Some are certified for food safety. They collapse when empty, saving space.