Abstract: A case packer includes a mass flow conveyor moving containers in defined lanes and lane deflectors for urging containers laterally across the conveyor into a selectively actuable metering station. Containers are selectively metered into row groups of select count and segregated by transfer guides on an underlying transfer conveyor. The row groups are directed to move rearwardly or upstream on the forward moving transfer conveyor into alignment with an open case mouth. A rotary loader has extensible can pushers maintained in parallel with open case mouth during a substantial portion of movement of the cases past the rotary loader. This maintains the rows of cans in proper alignment for final case loading and prevents undesirable "A" pattern lock up. The transfer guides and rotary loader can be adjusted and/or modified to handle varied row counts of cans.