The conveyor belts automatically accumulate, transport and condition bags as they travel towards the manipulator. Centering flaps in the manipulator ensure the accurate positioning of the bags onto the pallet, and control height of drop for the placement of boxes and crates. Each layer is formed on the formation doors and placed in an interlocking pattern on the pallet. Each product layer is pressed against the formation doors using adjustable pressure creating flat product layer results. The pallet is also stacked in a four-sided enclosed stacking bin, all of which results in an exceptionally stable and accurate stack for any stackable product type, also done at very high speeds.