A reservoir assembly is provided for a personal vaporizer device, such as an electronic smoking article or an e-cigarette. The reservoir assembly comprises a housing which encloses a reservoir for storing a liquid to be vaporized, wherein the housing and/or the reservoir define a flow path for the liquid from the reservoir for vaporization of the liquid. The reservoir assembly further comprises a mouthpiece provided in or on the housing and defining a channel for conveying vapour formed from the liquid to a user's mouth. The mouthpiece is configured for movement between a first position and a second position, wherein the flow path is closed or blocked when the mouthpiece is in the first position and wherein the flow path is open in the second position. Also provided is a personal vaporizer device, such as an electronic smoking article or an e-cigarette, which includes such a reservoir assembly.