Stacking system and method

A system for forming horizontally stacked groups of containers includes an infeed screw set, an orienting screw set, and a grouping mechanism. Containers are presented to the infeed screw in a vertical orientation, and are progressed from the infeed screw set to the orienting screw set via a transitioning pocket defined by overlapping pockets of the infeed and orienting screw sets. As containers are progressed through the orienting screw the containers are rotated via a series of orienting pockets to a horizontal orientation and progressed via a series of nesting pockets to form a series of horizontally nested containers. The series is discharged to a grouping mechanism which separates a predefined number of containers from the series to form a horizontally stacked group, which is outfed from the stacking system.