A flexible intermediate bulk container, bulk bag, or big bag, is an industrial container made of flexible fabric that is designed for storing and transporting dry, flow-able products, such as sand, fertilizer, and granules of plastic. Here are some other common terms for FIBCs: 1-ton bag Woven polypropylene bulk sack Bulk sack Tote Specifications Filling Options Spout Filling Skirt Flap Open Top Open Top and tightening holes Open Top with draw cord Zip lock Discharge Options Closed Bottom Discharge spout Discharge spout with valve Full drop Bottom Discharge spout with drop bottom Load Range 500 2000 KG Safety factor Generally, 5:1 or 6:1