An order fulfillment method, comprising: storing a plurality of inventory items in a warehouse and a plurality of customer orders in a data base, wherein the inventory items make up the customer orders, wherein some of the orders being a single item order having only one inventory item assigned to that order and other of the orders being multiple item orders having multiple inventory items assigned to that order; identifying inventory items withdrawn from the warehouse with an identifier and applying the identity of each withdrawn inventory item to the data base and matching that inventory item with a customer order; combining inventory items together that make up an order with a sortation system, said sortation system having an induct subsystem and a pouch sorter; said induct subsystem having an input and including an another bulk flow conveyor as well as an automated pouch opener, wherein said pouch opener is responsive to said data base to open a pouch to receive an inventory item of a multiple item order and is responsive to said data base to not open a pouch for an inventory item of a single-item order, said another bulk flow conveyor is subjacent said pouch opener, wherein an inventory item supplied to a non-opened pouch falls to said another bulk flow conveyor; said pouch sorter having individual pouches connected with an overhead conveyor, said overhead conveyor adapted to route pouches; transporting inventory items from the warehouse to said input with a transportation system; forwarding inventory items assigned to single item orders to a packing station with said another bulk flow conveyor, said induct subsystem responsive to said data base; forwarding inventory items assigned to multiple-item orders to said pouch sorter with said induct subsystem, said induct subsystem responsive to said data base; and said pouch sorter comprises a buffer that is adapted to accumulate pouches with inventory items therein and an accumulator that is adapted to receive pouches with inventory items therein from said buffer when all or a portion of inventory items that make up a multiple item order are in said buffer, said accumulator preparing that multiple item order to be routed to said packing station. storing a plurality of inventory items in a warehouse and a plurality of customer orders in a data base, wherein the inventory items make up the customer orders, wherein some of the orders being a single item order having only one inventory item assigned to that order and other of the orders being multiple item orders having multiple inventory items assigned to that order; identifying inventory items withdrawn from the warehouse with an identifier and applying the identity of each withdrawn inventory item to the data base and matching that inventory item with a customer order; combining inventory items together that make up an order with a sortation system, said sortation system having an induct subsystem and a pouch sorter; said induct subsystem having an input and including an another bulk flow conveyor as well as an automated pouch opener, wherein said pouch opener is responsive to said data base to open a pouch to receive an inventory item of a multiple item order and is responsive to said data base to not open a pouch for an inventory item of a single-item order, said another bulk flow conveyor is subjacent said pouch opener, wherein an inventory item supplied to a non-opened pouch falls to said another bulk flow conveyor; said pouch sorter having individual pouches connected with an overhead conveyor, said overhead conveyor adapted to route pouches; transporting inventory items from the warehouse to said input with a transportation system; forwarding inventory items assigned to single item orders to a packing station with said another bulk flow conveyor, said induct subsystem responsive to said data base; forwarding inventory items assigned to multiple-item orders to said pouch sorter with said induct subsystem, said induct subsystem responsive to said data base; and said pouch sorter comprises a buffer that is adapted to accumulate pouches with inventory items therein and an accumulator that is adapted to receive pouches with inventory items therein from said buffer when all or a portion of inventory items that make up a multiple item order are in said buffer, said accumulator preparing that multiple item order to be routed to said packing station.