Abstract: A pressure sensitive one-way valve to control the release of pressurized gas from a sealed container wherein the sealed container has at least one venting aperture therein. The valve comprises a first layer of flexibly resilient material having an upper surface and a lower surface. At least the periphery of the lower surface of the first layer is adhered to the outer surface of the container and at least a portion of the interior of the lower surface is separable from the outer surface of the container. The separable portion and the portion of the outer surface of the container adjacent thereto forming an expansion chamber that is in communication with the venting apertures such that passage of gas through the venting aperture causes expansion of the expansion chamber. The expansion chamber also has a gas release aperture extending therethrough.