Grid framework structure

A grid framework structure configured to support one or more load handling devices thereupon, said grid framework structure comprising:

• i) a first set of grid members extending in a first direction and a second set of grid members extending in a second direction, the first direction being substantially perpendicular to the second direction, to form a grid structure containing a plurality of grid cells lying in a horizontal plane, wherein the first set of grid members and the second set of grid members intersect at nodes;
• and
• ii) a plurality of vertical uprights for supporting the grid structure above ground to create a storage space for storage of one or more containers in a stack such that, when in use, one or more load handling devices operative on the grid structure can lift one or more containers through a grid cell from a stack below the grid structure,
• wherein the plurality of vertical uprights are arranged such that a section of the grid structure containing four adjoined grid cells is supported by five or fewer vertical uprights and the plurality of vertical uprights are arranged to support the grid structure at alternate nodes in the first direction and in the second direction and the plurality of vertical uprights are arranged for guiding the one or more containers in a stack along a pair of diagonally opposing corners of the one or more containers.