Object handling system and method

A vehicle for use with an object handling system, the object handling system including two substantially perpendicular sets of rails forming a first grid, a plurality of first uprights supporting the first grid, a plurality of containers arranged in stacks, each stack being located underneath the first grid, one or more robotic load handling devices configured to drive on top of the rails of the first grid, the one or more load handling devices including means for removing or replacing at least one container from the stacks, the vehicle comprising:

• two substantially perpendicular sets of rails forming a second grid substantially at the top of the vehicle above a storage space for carrying containers, wherein the second grid is configured to interface with the first grid to allow the one or more load handling devices to drive from the rails of the first grid onto the rails of the second grid to move a container from the object handling system to the storage space of the vehicle and vice versa.