Abstract: Building block systems that can utilize either commonly available containers locked and spaced together by locking members or a pre-molded one piece container and locking member system. Either system can utilize two or four spaced containers in the locking member. Also, both systems may use commonly available material, such as sand or dirt, to fill the top opened containers to provide insulation and strength to the vertically formed structure. Interior and exterior facing materials, such as sheet rock, lattice for applied stucco, precast rock or brick may be attached to the joined containers. Locking members may have internal parallel raceway holes in which backing strips may be inserted to permit the attachment of the the exterior and interior panels to the blocks. Either vertical or horizontal cut out portions may extends along the interior side of the locking members to permit utility conduits (pipes, wires, etc.) to be inserted before the interior panel is fastened.