A container using a flexible membrane integrated into the throat or egress passageway of a bottle. The membrane forms a portion of the passageway's sidewall. The membrane flexes inward when an external force is applied causing the inner walls of the passageway to frictionally mate together and restrict the flow of a fluid or non-fluid through the passageway and flexes outward when the force is removed allowing the inner walls of the passageway to move away from one another and allow the flow of the fluid through the passageway.