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A CONTAINER AND CONTAINER CLOSURE COMPRISING, CONTAINER WALLS AND A CONTAINER CLOSURE MEMBER DEFINING A GENERAL SPACE WITHIN THE CONTAINER, SAID CLOSURE MEMBER INSERTABLE IN AN APERTURE IN ONE OF SAID CONTAINER WALLS, A RIM MEMBER IN SAID CONTAINER WALL SURROUNDING SAID APERTURE, A SEAT INCLUDED IN SAID RIM MEMBER PREVENTING THE COMPLETE PASSAGE OF SAID CLOSURE MEMBER THROUGH SAID APERTURE INTO SAID CONTAINER GENERAL SPACE, A PERIPHERAL FLANGE ON SAID CLOSURE MEMBER OVERLYING SAID RIM MEMBER SEAT, A PREFORMED RESILIENT RING ELEMENT INTERPOSED BETWEEN SAID CLOSURE MEMBER PERIPHERAL FLANGE AND SAID RIM MEMBER SEAT, SAID RESILIENT ELEMENT BEING COMPRESSED BY SAID FLANGE AND SAID SEAT WHEN THE CLOSURE MEMBER IS IN THE INSERTED POSITION, SAID COMPRESSED RESILIENT ELEMENT PROVIDING A FORCE TENDING TO EJECT SAID CLOSURE MEMBER FROM SAID APERTURE, SAID COMPRESSED RESILIENT ELEMENT PROVIDING A FLUID-TIGHT SEAL BETWEEN SAID CONTAINER WALL AND SAID CLOSURE MEMBER, RETAINING MEANS MAINTAINING SAID CLOSURE MEMBER IN SAID APERTURE IN SAID INSERTED POSITION AND PREVENTING SAID EJECTION OF SAID CLOSURE MEMBER, SAID RETAINING MEANS MAINTAINING SAID COMPRESSION OF SAID RESILIENT ELEMENT AND MAINTAINING SAID FLUID-TIGHT SEAL WHEN SAID CLOSURE MEMBER IS IN SAID INSERTED POSITION, SAID RETAINING MEANS COMPRISING A DEFORMABLE C-RING PARTIALLY INSERTED INTO AN ANNULAR GROOVE IN SAID RIM MEMBER WHEREBY SAID C-RING OVERLIES SAID RIM MEMBER AND SAID CLOSURE MEMBER AND PREVENTS REMOVAL OF SAID CLOSURE MEMBER FROM SAID APERTURE AND PREVENTS SAID EJECTION OF SAID CLOSURE MEMBER AND MAINTAINS SAID CLOSURE MEMBER IN SAID INSERTED POSITION, SAID CLOSURE MEMBER BIASED AGAINST SAID C-RING AND SAID C-RING BIASED AGAINST SAID RIM MEMBER BY SAID FORCE PROVIDED BY SAID RESILIENT ELEMENT WHEN SAID CLOSURE MEMBER IS IN SAID INSERTED POSITION WHEREBY VIBRATION OF SAID C-RING IS PRECLUDED, SAID C-RING BEING CAPABLE OF TEMPORARY DEFORMATION IN ITS OWN PLANE TO A SUFFICIENT EXTENT TO OVERLIE ONLY A SELECTED ONE OF SAID MEMBERS WHEREBY MAINTAINING SAID SUFFICIENT DEFORMATION PRMITS REMOVAL OF SAID CLOSURE MEMBER FROM SAID APERTURE, A CURB IN SAID SELECTED OVERLAIN MEMBER WHEREBY SAID SUFFCIENT TEMPORARY DEFORMATION OF SAID C-RING TO OVERLIE ONLY SAID SELECTED MEMBER IS PREVENTED WHEN SAID CLOSURE MEMBER IS IN SAID INSERTED POSITION, MEANS IN SAID MEMBER OTHER THAN SAID SELECTED MEMBER PRECLUDING SAID CRING MEMBER FROM BEING TEMPORARILY DEFORMED TO A SUFFICIENT EXTENT TO OVERLIE SAID MEMBER OTHER THAN SAID SELECTED MEMBER WHEN SAID CLOSURE MEMBER IS IN SAID INSERTED POSITION, SAID CLOSURE MEMBER IN SAID INSERTED POSITION CAPABLE OF BEING DISPLACED INWARDLY OF SAID CONTAINER BY THE APPLICATION OF SUBSTANTIAL FORCE TO SAID CLOSURE MEMBER, SAID SUBSTANTIAL FORCE BEING SUFFICIENT TO OVERCOME SAID FORCE PROVIDED BY SAID COMPRESSED RESILIENT ELEMENT AND SUFFICIENT TO FURTHER COMPRESS SAID ELEMENT WHEREBY SAID CLOSURE MEMBER MAY BE DISPLACED INWARDLY OF SAID CONTAINER AND WHERE TOOLS OTHER THAN ORDINARY HAND TOOLS ARE REQUIRED TO GENERATE SAID SUBSTANTIAL FORCE, SAID CLOSURE MEMBER CAPABLE OF BEING REMOVED FROM SAID INSERTED POSITION IN SAID APERTURE BY THE APPLICATION OF A SAID SUBSTANTIAL FORCE PROVIDING A SAID CLOSURE MEMBER INWARD DISPLACEMENT EQUAL TO AT LEAST THE HEIGHT OF SAID CURB SUCH THAT SAID DISPLACEMENT OF AT LEAST CURB HEIGHT ALLOWS SAID C-RING TO BE TEMPORARILY DEFORMED IN ITS OWN PLANE TO A SUFFICIENT EXTENT TO OVERLIE ONLY SAID SELECTED ONE OF SAID MEMBERS THEREBY PERMITTING REMOVAL OF SAID CLOSURE MEMBER, AND TOOL-ACCEPTING MEANS ON SAID C-RING WHEREBY SAID TEMPORARY DEFORMATION OF SAID C-RING AND MAINTENANCE OF SAID SUFFICIENT DEFORMATION OF SAID C-RING BY TOOL MEANS IS FACILITATED.