In various embodiments, the invention provides enhanced structures, devices, and techniques that allow fluids and liquid products, such as cosmetics, to dispense in a more even, smoother, and more predictable manner from fluid containers. In one embodiment, a plug is positioned within at least a portion of an interior of a nozzle of a fluid container. The plug may include a base portion having at least one fluid flow opening formed therein and a bellows portion. In operation, the bellows portion may expand to an elongated state upon application of a threshold fluid pressure to create a pathway for communicating fluid, and may contract to a compressed state which creates a fluid communication seal between a fluid repository and dispensing orifice of the fluid container.