EE WAS SEALING BAGS ON INGLETT MACHINE. BAG ON CONVEYOR STARTED TO FALL OVER. EE LEANED OVER TO PICK IT UP. EE WAS USED TO 1 CF BAGS AND DIDN'T ANTICIPATE THE WEIGHT OF 2 CF BAG. EE LIFTED THE BAG AND FELT PAIN IN MIDDLE OF HIS BACK. ON 6/1/04 EE REPORTED THAT HIS BACK WAS WORSE AND TREATMENT WAS NECESSARY.