a concrete burial vault system having a layered construction of castable material encased in an inner liner and an outer casing of a thermoplastic polymer such as polypropylene utilizes the liner and casing as a mold for the concrete and enables monolithic molds with self - supporting securing tabs . this system allows the liner and casing to be manufactured at a central location and then transported to a plurality of use locations to be filled with concrete . the manufacturing method supports the system and provides an assembly advantage .