A system (10/200) for removing cartons from containers for loading into a product packaging machine, comprising: a case infeed along which the containers are fed in series to a magazine conveyor; an inverting assembly receiving the containers from the case infeed, the containers are engaged by an inverter head of the inverting assembly, the inverter head is mounted on a carriage and transports the containers about an extended, orbital path over and above a layer pad magazine access area along the path of movement of the container and places the containers with the cartons stacked therein in an inverted position on the magazine conveyor; a stack pusher assembly for engaging and supporting the cartons in their stacked configuration as the cartons are moved along the magazine conveyor toward the discharge of the magazine conveyor for feeding the cartons to a magazine for the packaging machine; a decasing assembly movable along the magazine conveyor between a loading position adjacent the case infeed and a case removal position, characterized by: the decasing assembly including an adjustable frame with a plurality of adjustable guide rails (62, 63) that are adjustable along rails and are movable to configure the decasing assembly to receive containers having different sizes and/or configurations with the cartons stacked therein, the decasing assembly further including a series of containment rod mechanisms each including a vertically extensible containment rod, the containment rod mechanisms being carried on adjustable supports or holders to enable variation of the longitudinal positions of the containment rod mechanisms as needed to accommodate varying depth or length containers and being configurable to substantially match the sizes and/or configurations of the cartons received as needed to substantially contain and maintain the cartons in a stacked configuration as the cartons are removed from the containers and moved along the magazine conveyor toward a discharge thereof; a case infeed along which the containers are fed in series to a magazine conveyor; an inverting assembly receiving the containers from the case infeed, the containers are engaged by an inverter head of the inverting assembly, the inverter head is mounted on a carriage and transports the containers about an extended, orbital path over and above a layer pad magazine access area along the path of movement of the container and places the containers with the cartons stacked therein in an inverted position on the magazine conveyor; a stack pusher assembly for engaging and supporting the cartons in their stacked configuration as the cartons are moved along the magazine conveyor toward the discharge of the magazine conveyor for feeding the cartons to a magazine for the packaging machine; a decasing assembly movable along the magazine conveyor between a loading position adjacent the case infeed and a case removal position, characterized by: the decasing assembly including an adjustable frame with a plurality of adjustable guide rails (62, 63) that are adjustable along rails and are movable to configure the decasing assembly to receive containers having different sizes and/or configurations with the cartons stacked therein, the decasing assembly further including a series of containment rod mechanisms each including a vertically extensible containment rod, the containment rod mechanisms being carried on adjustable supports or holders to enable variation of the longitudinal positions of the containment rod mechanisms as needed to accommodate varying depth or length containers and being configurable to substantially match the sizes and/or configurations of the cartons received as needed to substantially contain and maintain the cartons in a stacked configuration as the cartons are removed from the containers and moved along the magazine conveyor toward a discharge thereof;