fig1 as with the previously described interlocking of locking notch 40 with side locking rail 18 this alternative interlocking structure locking foot 140 and horizontal retaining member 139 provides a very strong container requiring a minimum of additional fasteners referring now to fig2 base member 12 can be any shape but is preferably rectangular in configuration and is preferably made up of front base rail 14 parallel rear base rail 16 and one or more parallel interior base rail s 23 substantially perpendicular to the aforesaid base rails 14 16 23 and mechanically fastened thereto are preferably one or more base member support s 13 side locking rails 18 and one or more horizontal load support s 20 the length of side locking rails 18 and horizontal load support s 20 which are substantially the same define the distance between front base rail 14 and rear base rail 16 conversely the distance between side locking rails 18 substantially defines the length of front base rail 14 rear base rail 16 and interior base rail s 23 preferably in each of the four corners of the base member 12 a vertical member support interlock pocket 22 is formed by the intersection of front base rail 14 and a first interior base rail 23 or rear base rail 16 and a second interior base rail 23 and perpendicular thereto first and second side locking rails 18 and first and second horizontal load supports 20 as will be further discussed the vertical member support.