Abstract: A funiary urn is disclosed. The urn includes a pedestal, a canister and a cap. The pedestal is attached to the canister by a bolt and a nut having an axially extended nut shank of non-circular cross-sectional shape for engaging mating apertures in the pedestal and in the canister. A gasket compressed between the inner canister surface and the nut top provides a seal inhibiting gas flow into or out of the canister at the attachment opening. When the cap is assembled to the canister, an inwardly embossed cap lip extends continuously around the cap at a locus spaced above the cap edge so as to engage the canister top edge and form a seal inhibiting gas flow. The cap is drawn tightly into its sealed position by an arrangement of detents and detent-accepting grooves.