Flat products (e.g. pre-cut parts or flat collapsible boxes) are often arranged in large, usually flat outer packagings, either bundled or loose. Since the pre-cut parts frequently have unequal thicknesses, individual bundles are packed offset to each other. Partitions and intermediate layers can be used for stabilization and to protect the pre-cut parts. The bespoke add-on module in MultiPack for this problem optimizes the arrangement of the pre-cut parts in the outer packaging. The outer packaging can be fixed, chosen from a list of existing outer packagings or adapted to the product and the storage space on the pallet.