Abstract: A method for changing cavities (24) for molding containers for a blow-molding station (14), including: a plurality of mold carrier units (22), each having a first mold (16A) consisting of a plurality of portions that are capable of being attached together so as to form a first cavity (24A); a first element for arranging the first attached molds (16A); and a second element for arranging the second attached molds (16B). The method for changing all of the first cavities (24A) includes at least one first pre-preparation step (E1) during which all of the second molds (16B) are stored in the detached state on a first intermediate storage stand (39, 54) while the blow-molding station (14) still produces containers using the first molds (16A). The invention also relates to a dynamic storage device.