fig1 shows a side view of the bottom latch tab fig1 shows a sectional view of the latch engaged between the top and bottom housings fig1 shows a detailed view of the engaged between the top and bottom housings the bottom housing 100 has at least one latch that engages in a corresponding notch 75 located on the top housing 50 the top surface 74 of said latch 70 is located at a height 76 that is below the top surface of said at least one rib 141 the height 76 of the latch 70 is equal to or lower than the inner wall 141 structure this allows equipment to interface with the bottom member of the container without interference with the equipment and latch height this further reduces the possibility of damage to the latch 70 if the bottom housing 100 is dragged on a surface in the preferred embodiment there are four latches 70 and four corresponding notches 75 located in each corner region of said top housing 50 or said bottom 100 housing but as few as one or two are contemplate as well as four or more latches fig1 shows that the notch 70 has a curve entry ramp 77 and a recess 78 that elevates the latch 70.