A burial vault is a protective outer container for the casket. Though not required by law in all states, most cemeteries do require an outer container. Many families select a burial vault for the additional peace of mind it brings. A reinforced burial vault provides long-lasting protection needed to resist elements and physical conditions - including ground water, and weight from heavy equipment - over time. The burial vault also protects the casket and keeps the ground intact, thus preserving the beauty of the cemetery or memorial park.