Abstract: A baffle or reinforcement element for sealing and/or reinforcing a cavity, in particular a cavity of a vehicle, comprising: a carrier plate with a first plate surface and a second plate surface, and at least a first and a second expandable element, in particular expandable foam element, supported by the carrier plate, wherein the first expandable element covers, at least substantially, the entire first plate surface and forms a first outer surface of the baffle or reinforcement element and the second expandable element covers, at least substantially, the entire second plate surface thereby forming a second outer surface of the baffle element.