as shown in fig2 and 3 the hollow body 5 preferably includes at least one latch mechanism 25 and preferably includes a plurality of such latch mechanisms 25 the latch mechanism 25 preferably includes an enlarged head or male portion 45 formed on the periphery 40 and protruding from a first recessed portion 50 formed on one of the top section 10 or a bottom section 15 of the hollow body 5 and a correspondingly shaped cavity or female portion 55 formed on the periphery 40 as part of a second recessed portion 60 on the other one of the top section 10 or the bottom section 15 of the hollow body 5 for receiving or mating with the head 45 to join close or seal the top and bottom sections 10 15 along the peripheral 40 mating area between the top section 10 and bottom section 15 of the hollow body when the hollow body 5 is in the closed or assembled state as shown in fig7 a b the head 45 preferably is constructed with an enlarged protrusion 65 such that as the head 45 makes initial contact with the cavity 55 the head 45 moves in a direction away from the periphery 40 of the hollow body 5 so as to be received into the cavity 55 after the head 45 is completely received into the cavity 55 material memory and or compressive hoop stress causes the head 45.