A system and method are disclosed of operating a plurality of fulfillment centres, including a large fulfillment centre and a small fulfillment centre, each of the fulfillment centres being configured to fulfil customer orders. A first product and a second product are received at the large fulfillment centre. Desired quantities of the first and second products are picked at the large fulfillment centre for packing into a container, wherein the desired quantities include at least one of: quantities ordered by at least one customer to be fulfilled at the large fulfillment centre or the small fulfillment centre, and quantities predicted to be ordered by at least one customer and to be fulfilled at the small fulfillment centre.