Abstract: A container for photographic processing composition being releasably sealed by a novel seal provided by a flexible web releasably bonded to a plurality of lips surrounding an aperture in the container. The novel seal is such that, owing to its relatively small area of bonding between the web and the lips, it assures proper separation of the web from the lips when a pulling force is exerted on it. The seal formed by the bonding of the web to the plurality of lips is such that it withstands rupture that might result from excessive internal pressure in the composition when subjected to shock forces.