Abstract: An interment container includes upper and lower members that define an internal cavity. The remains of a deceased are placed within a liner adapted to be positioned within the internal cavity. The liner is peripherally sealed about the remains of the deceased, to prevent leakage of fluids from within the liner and infiltration of fluids into the liner. The liner includes lower and upper sections that define facing peripheral flanges which are sealed together by positioning a heating member between facing surfaces of the flanges, and imparting heat to the heating member so as to liquefy the adjacent material of the flanges. The liquefied material flows together about the heating member and the heating member is then cooled, such that the liquefied portions of the flanges solidify to integrally seal the flanges together.