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An ice bag is described having a bladder formed with an opening, a threaded receiver coupled to the bladder at the opening, a threaded cap having a first portion formed of a rigid material and a second portion formed of an overmold material, the second portion providing a seal between the receiver a

An ice bag is described having a bladder formed with an opening, a threaded receiver coupled to the bladder at the opening, a threaded cap having a first portion formed of a rigid material and a second portion formed of an overmold material, the second portion providing a seal between the receiver and cap with the cap threaded into the receiver.

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1. A cap comprising; a first portion formed of a rigid material, said first portion having a hollow cylindrical portion with an outer cylindrical surface having threads formed on a portion of the outer cylindrical surface, a flange having a first side and an opposed second side, the flange extending

1. A cap comprising; a first portion formed of a rigid material, said first portion having a hollow cylindrical portion with an outer cylindrical surface having threads formed on a portion of the outer cylindrical surface, a flange having a first side and an opposed second side, the flange extending outwardly from the outer cylindrical surface, and at least two ribs, each rib having a curved surface extending from a location on the second side of the flange to a location on the outer cylindrical surface, the first portion formed with a through-hole in said flange; anda second portion formed of an overmold material, the second portion extending through the though-hole and establishing a seal on the first side of the flange and overlying a surface of the second side of the flange with the second portion extending between the ribs to establish a mechanical anchor for the seal. 2. A cap as recited in claim 1 wherein each said rib extends from the flange to a curved outer edge. 3. A cap as recited in claim 2 wherein said overmold material extends from the flange and past the outer edge of each rib to establish a grip surface for the cap. 4. A cap as recited in claim 1 wherein said first portion is formed with a plurality of through-holes. 5. A cap as recited in claim 1 wherein said overmold material is a thermoplastic elastomer. 6. A cap as recited in claim 1 wherein said rigid material is a plastic. 7. A threaded cap for covering an opening of a container and providing a seal between the cap and the container, the threaded cap comprising; a rigid portion having a threaded cylinder with a cover overlaying a first cylinder end and a flange having a first side and a second side, the flange extending from the threaded cylinder, the flange formed with a through-hole, the flange second side and cover establishing a first surface having raised portions and recessed portions; andan elastomeric portion extending through the though-hole and overlaying the recessed portions of the first surface to establish an anchor for the seal having an annular portion and at least one connecting portion, the connecting portion extending from a first location on the annular portion to a second location on the annular portion and overlying at least a portion of the first side of the flange. 8. A threaded cap as recited in claim 7 wherein said elastomeric portion is made of a thermoplastic elastomer. 9. A threaded cap as recited in claim 7 wherein said elastomeric portion is made of an overmold material. 10. A threaded cap as recited in claim 7 wherein said flange is formed with a plurality of through-holes. 11. A threaded cap as recited in claim 7 wherein said rigid portion is made of a plastic. 12. A threaded cap as recited in claim 7 wherein said container is an ice bag. 13. A threaded cap as recited in claim 7 wherein the elastomeric portion overlaying at least a portion of the flange first side establishes the seal. 14. A threaded cap as recited in claim 7 wherein the connecting portion is a first connecting portion and the elastomeric portion overlaying the recessed portions of the first surface has a second connecting portion, extending from a third location on the annular portion to a fourth location on the annular portion. 15. A method for producing a cap comprising the steps of; molding a first threaded component formed of a rigid material, said first component having a hollow cylindrical portion with an outer cylindrical surface having threads formed on a portion of the outer cylindrical surface, a flange having a first side and an opposed second side, the flange extending outwardly from the outer cylindrical surface, and at least two ribs, each rib having a curved surface extending from a location on the second side of the flange to a location on the outer cylindrical surface, the first threaded component formed with a through-hole in said flange; andovermolding a thermoplastic elastomer material on the first threaded component, the thermoplastic elastomer material extending through the though-hole and establishing a seal on the first side of the flange and overlying a surface of the second side of the flange with the second portion extending between the ribs to establish a mechanical anchor for the seal. 16. The method as recited in claim 15 wherein said overmolding step is accomplished using a multi-shot injection molding process. 17. The method as recited in claim 15 wherein said overmolding step is accomplished using an insert molding processes. 18. The method as recited in claim 15 wherein the first threaded component is formed with a plurality of through-holes.