Abstract: A method of storing an enclosed entombment casket in the chamber of an above-ground burial crypt is provided wherein a compact, lightweight casket enclosure made from a thermoplastic resinous material which is impervious to gases and liquids and which is chemically resistant to the highly corrosive liquids used in the embalming process, notably formaldehyde, is first placed into the crypt chamber and positioned so that it will be completely contained inside the chamber with an open end located close to but spaced from the entrance opening of the chamber. The enclosed entombment casket is then inserted into the casket enclosure through its open end which is then closed and sealed by a gas and liquid impermeable cover made from the same thermoplastic resinous material. The cover is provided with a generally U-shaped sealing channel disposed around its outer periphery which is adapted to receive in an abutting relationship the peripheral edges of the casket enclosure which surround the open end.