Generating container plans for multi-item orders

Technologies are described herein for generating container plans for multi-item orders. The items of the order are divided into zones, where the zones may determine the picking zone and/or packaging requirements for the item. Zone-based container plans are generated for the items in the order associated with each individual zone. The container plan includes an assignment of each item to one or more logical shipping containers. A mixed container plan is also generated for all the items in the order regardless of the associated zone. If the number of logical shipping containers in the mixed container plan is less than the total number of logical shipping containers in the zone-based container plans, then a final container plan for the order is generated from the mixed container plan. Otherwise, the final container plan is generated by combining the zone-based plans for each zone associated with items in the order.