There are provided systems and methods relating to assembling unpacked merchandise in containers. In one form, the system includes an order of merchandise items to be assembled in containers, and a predetermined set of containers defining different sizes and including at least two different types of containers. The system also includes a control circuit configured to: receive notification of the order, select a first type of container, determine a first subset of the plurality of merchandise items to be received in the selected type of container, select a size of the selected type of container to receive the first subset of merchandise items, and instruct the disposition of the first subset of merchandise items within the selected type and size of container.