Vial and closure

In a two-compartment container having a constriction between the two compartments capable of receiving a removable plug which provides a liquid-tight barrier between the two compartments, said container having a neck communicating with one of said compartments and said neck having a radially outwardly projecting and annular rim adjacent the free end thereof, a closure structure comprising:

• a resiliently flexible, substantially cylindrical stopper having a first portion with an outside diameter slightly larger than the inside diameter of said neck and snugly receivable into said neck and a second portion of reduced diameter projecting beyond the free end of said neck;
• resiliently flexible cap means of substantially circular cross section having a fastening portion telescopically receivable onto the free end of said neck, said fastening portion having opposing means for gripping said rim, said fastening portion including annular means overlying the upper edge of the stopper first portion so as to oppose its removal from the vial, and said cap means having a sleeve portion of reduced diameter snugly but slidably receivable onto the second portion of said stopper, said sleeve portion being attached to said fastening portion by manually fracturable means, said sleeve portion being slidably receivable with the second portion of said stopper through said annular means and into said neck by the application of force urging said sleeve portion toward said container;
• cooperable lock means on said sleeve portion and said annular means for positively opposing movement of said sleeve portion out of said vial after said sleeve portion has been moved a preselected distance through said annular means;
• and
• shield means attached to said outer end of said sleeve portion of said cap means for closing the outer end thereof.