Ingredients that are packaged in consumer and agricultural packaging applications can offgas or consume airspace in their containers, causing leakage or distortion. Packages or containers that leak cause damage to labels, waste product and harm brand image. Wall thickness of the container is increased to solve this problem. This may temporarily solve container distortion issues, however, more materials are used in the process and this has a direct effect on the overall container cost, recycling costs and package sustainability score. The 3fl cap liner from gore is constructed of a gas permeable expanded eptfe membrane that prevents liquid penetration, while equalizing pressure inside of a container. By using a 3fl cap liner, customers are able to reduce the weight of their containers and save on recycling costs which helps them improve their overall sustainability scores.