When a pick list is generated, a PTL (Pick-to-Light) device on a cart flashes for a picker to start filling the order. As the picker moves through the warehouse, the devices flash with the picker’s name, SKU and quantity to pick. The devices can even be programmed to play a little tune, personalized to the picker, or direct the picker to a certain location to pick the product. Once the order is filled, the cart can be parked until a PTL device tells a free packer to take the cart and begin packing the order complete with any special packing instructions, the packer can even confirm the pick before sending it to the shipping area. A shipping staffer can then take the package, weigh it, follow special shipping instructions on the PTL device, and get it to the appropriate carrier. At all times the continuity of the order is intact with a more efficient order fulfillment process.