there is disclosed a releasable closure for a container which is particularly suitable for plastic bags . the closure is formed by a pair of opposed bands of static cling vinyl film , preferably polyvinyl chloride , which extend along the mouth of the container and which are permanently secured thereto . the bands of static cling vinyl extend inwardly , into the container where they form internal flaps that are coextensive the length of the mouth of the container , thereby forming internal flaps within the bag . these internal flaps provide the pressure resistant capability of the resealable closure , permitting it to retain its fluid - tight characteristic against internal pressures .