Easy open closure system

An end portion for a container, said end portion having at least one preformed opening and an easy open closure system for said opening, said easy open closure system comprising:

• a. an interior sheet material which covers the underside of said opening and which is firmly adhered to the bottom of said end portion circumjacent said opening, said interior sheet comprising
• i. a backing member of about 15 to 100 micrometers in thickness and having a ppt value in the range of about 15 to 200 grams/ply;
• ii. a layer of adhesive having a thickness of about 3 to 100 micrometers, firmly adhering said backing member to said end portion;
• b. an exterior flexible film circumjacent said opening, said flexible film at least 6.3 mm in width and about 25-250 micrometers in thickness which neither breaks nor elongates more than 25% under a tension of 4 pounds (1.8 kg) and which is capable of being pulled back upon itself without rupturing, wherein said flexible film is essentially free of adhesive and is bonded to said interior sheet material in the area of said opening by means of said layer of adhesive of said interior sheet material;
• wherein said means of adhesive attachment will withstand a force of up to 22 pounds per inch width (3.9 kg per cm width) of said exterior flexible film at temperatures from at least 35.degree. F. to 100.degree. F. (2.degree. to 38.degree. C.) without separation of said flexible film from said interior sheet material and wherein at least one of said flexible film and said interior sheet material is moisture impervious.