Patent ID: 7709069

Claim:
A high temperature, venting food preparation bag comprising: a sealed end, at least one side wall extending away from said sealed end, each of said at least one side wall having a distal edge, an interior surface, and an exterior surface, wherein said sidewall comprises a first thermoplastic film comprising at least about 75 weight percent, based on the total weight of said first thermoplastic film, of a thermoplastic polymer, the first thermoplastic film suitable for high temperature applications greater than about 220° F., an open end defined by said distal edge, at least one vent in said at least one side wall, said at least one vent connecting said interior surface to said exterior surface, at least one vent seal comprising a second thermoplastic film attached to one of said exterior surface or said interior surface of said at least one sidewall to close said at least one vent, the second thermoplastic film suitable for high temperature applications greater than about 220° F., and a non-adhesive seal attaching said at least one vent seal to said exterior or interior surface of said at least one sidewall, wherein said first thermoplastic film and said second thermoplastic film comprise different materials having different heat shrink properties, wherein one of said first thermoplastic film and said second thermoplastic film comprises a heat shrink material that shrinks at least 5% at more than about 100° F. causing the vent seal to at least partially detach from the at least one sidewall.