A Bulk Bag or FIBC (Flexible Intermediate Bulk Container) is a large woven bag designed to carry bulk materials.

Bulk Bags range in size from 28" x 28" x 12" to 51" x 51" x 71", (filled dimensions) and may contain up to 4000lbs of material depending on design. They differ from RIBCs (Rigid Intermediate Bulk Containers) by having flexible walls and tend to be for dry bulk solids.

However, recent developments in bag liners and bag manufacturing have allowed the bulk bag to be used in other applications as well.