Abstract: A shipping bag for powder or granular material which is comprised of a square external bag of flexible sheet having an inlet at its top end and an outlet at its bottom end and a cylindrical internal casing of the same material as that of the external bag, said cylindrical internal casing at its circumference being joined with an inner wall of the external bag to form four corner spaces through four partitions of unjoined circumference of the internal casing which are respectively provided with a number of slits in multistage for passing the material into the corner spaces.