axis c may be a longitudinal or a transverse centerline axis however any axis may be chosen from which to position the coupling members as chosen with sound judgment the interlocking protrusions 42 may be positioned a distance d away from the centerline in a first direction similarly the interlocking recesses 46 may be positioned distance d away from the centerline a second opposite direction in this manner individual coupling members 30 may correspondingly be staggered on the same side or on opposite sides of the tray 2 so that when two trays 2 are juxtaposed the interlocking protrusions 42 of one tray 2 will align with the interlocking recesses 46 on the other tray 2 it is noted that any quantity of individual coupling members 30 may be positioned at any distance or distances with respect to a centerline axis as is appropriate for use with the embodiments of the subject invention with reference again to fig1 and 2 the coupling members 30 may be contiguously formed along the exterior of the tray 2 in particular the interlocking protrusion 42 may comprise a raised rib 44 extending along a distance of the wall portion 10 on the exterior of the tray 2 similarly the interlocking recess 46 may form a channel 49 also extending through a distance along the wall portion 10 it is noted here that any length width or height of the rib 44 and or channel 49 may be chosen as is appropriate for use with various configurations of the tray.