Abstract: A quick-removable closure attachment for the depending spout of a flexible hopper bag. The spout has a rigid horizontal conduit secured to its intermediate portion. To close the spout it is folded around the conduit. A holding clip has a bottom rod and a pair of gripping bars spaced upwardly from the rod, parallel thereto and located on opposite sides thereof at different heights. The bottom rod is inserted through the conduit and the folded spout is received grippingly between the gripping bars, holding the spout closed. To allow discharge from the hopper bag, the clip is withdrawn, allowing the spout to unfold and drop to its open depending position.