Meet the Stacker-Bot: an autonomous mobile robot for warehouses and distribution centers that can retrieve up to 5 cases each trip. As Conveyco explains:
Once up to five totes or cartons have been retrieved in the Stacker-Bot, it is directed via the WMS/WES software host the exact locations required to place the inventory. The rack, shelf level and shelf location for each of the five SKUs is communicated to the Stacker-Bot. The robot always travels via the shortest path to its put-away location.
The Stacker-Bot uses a 2D camera to find its locations. It verifies its position by scanning the barcode on the rack and shelf level. The robot has 500lbs capacity and can travel 1.64ft per second.