Tray / cup sealer with indexing flight bar drive system: trays can be automatically denested onto the conveyor deck and are transported via a push-bar type conveyor. At each index, containers are filled, sealed, lidded and automatically discharged. At the M.A.P. station, beneath a heat seal head and vacuum chamber assembly, the package head space is evacuated and gas flushed with a computer-controlled constant flow of inert gas (Nitrogen and/or Carbon Dioxide). Film is die-cut as the trays are sealed and wasted film is automatically collected on a quick release drive.