EE HAD PUT A SUPER SACK BAG ON MACHINE & STARTED TO FILL BAG WITH SLOWLY FALLING PRODUCT. HE TURNED AROUND TO PICK A A CARD TO INSERT IN SIDE OF BAG. WHEN HE TURNED BACK AROUND THE PRODUCT WAS FALLING RAPIDLY IN BAG. EE GRABBED BAG TO CENTER ON PALLET BUT BAG WAS TOO HEAVY TO MOVE, STRAINING HIS LEFT SHOULDER.