Hermetic closure system between a cover and a package

A hermetic closure system for a package having a first end defining an opening of the package, the hermetic closure system comprising:

• a cover having a central portion that lies substantially in a plane, and an outer peripheral portion joined to an outer edge of the central portion, the cover further comprising a generally ring-shaped first protuberance depending from the outer peripheral portion and extending substantially perpendicular to the plane of the central portion, the first protuberance having a generally U-shaped cross-section defined by a pair of walls arranged substantially parallel to each other and an arcuate portion extending between lower ends of the walls, a first lock element being formed on at least one of the walls of the first protuberance and projecting outward away from an interior of the U-shaped cross-section;
• and
• a receiving ring formed at the first end of the package surrounding the opening, the receiving ring extending about an axis and having a second protuberance that projects substantially parallel to said axis in a direction toward an opposite second end of the package and extends about substantially an entire perimeter of the ring, the second protuberance having a generally U-shaped cross-section defined by a pair of walls arranged substantially parallel to each other and an arcuate portion extending between lower ends of the walls, a second lock element being formed on at least one of the walls of the second protuberance and projecting outward away from an interior of the U-shaped cross-section;
• wherein the second protuberance receives the first protuberance therein such that the first and second lock elements engage each other in a locking manner.