A container handling vehicle for operation on a two-dimensional rail system comprising a first set of parallel rails arranged to guide movement of container handling vehicles in a first direction (X) across the top of a frame structure , and a second set of parallel rails arranged perpendicular to the first set of rails to guide movement of the container handling vehicles in a second direction (Y) which is perpendicular to the first direction, the first and second sets of parallel rails dividing the rail system into a plurality of grid cells , wherein the container handling vehicle comprises: - a wheel base unit comprising first and second sets of wheels for guiding the container handling vehicle along the rail system in the first and second directions (X, Y) respectively, wherein the first and second sets of wheels form outer peripheries of the wheel base unit ; - a body unit comprising: a lower section which is provided on the wheel base unit , the lower section having a footprint with a horizontal extent which is equal to or less than the wheel base unit , the lower section having an upper surface, the upper surface providing a first container carrying position for carrying a storage container ; a support section extending vertically from the lower section , the support section having a footprint with a horizontal extent which is smaller than the footprint of the lower section ; and a cantilever section extending horizontally from the support section beyond the footprint of the lower section ; and - a lifting device comprising a lifting frame that is suspended from the cantilever section . - a wheel base unit comprising first and second sets of wheels for guiding the container handling vehicle along the rail system in the first and second directions (X, Y) respectively, wherein the first and second sets of wheels form outer peripheries of the wheel base unit ; - a body unit comprising: a lower section which is provided on the wheel base unit , the lower section having a footprint with a horizontal extent which is equal to or less than the wheel base unit , the lower section having an upper surface, the upper surface providing a first container carrying position for carrying a storage container ; a support section extending vertically from the lower section , the support section having a footprint with a horizontal extent which is smaller than the footprint of the lower section ; and a cantilever section extending horizontally from the support section beyond the footprint of the lower section ; and a lower section which is provided on the wheel base unit , the lower section having a footprint with a horizontal extent which is equal to or less than the wheel base unit , the lower section having an upper surface, the upper surface providing a first container carrying position for carrying a storage container ; a support section extending vertically from the lower section , the support section having a footprint with a horizontal extent which is smaller than the footprint of the lower section ; and a cantilever section extending horizontally from the support section beyond the footprint of the lower section ; and - a lifting device comprising a lifting frame that is suspended from the cantilever section . <EOS>