US Patent 6886981 Grain bag

A grain bag is comprised of a cylindrical barrel having a lid openable and closable upwardly and a bottom part having an outlet tube at a center of a undersurface thereof, and developed with a flap attached in the vicinity of the outlet tube for shielding the outlet tube, a latch attached to a border of the flap through a contact string, and a latch retainer attached to a side of the barrel for catching the latch enabling engagement and disengagement of the latch and the latch retainer at the side of the barrel. The number of latches and latch retainers varies from one to plural numbers according to a size of a bag. Apart from a latch with a contact string and a latch retainer, looped strings are provided and coupled together by a hook.