Abstract: A method of changing container sizes on a container filling carousel, the carousel and container supports thereon, which carousel has one or more pairs of side-by-side first and second container supports, each container support having a frame, a container support platform and at least one pair of container support arms above the container support platform. Each of said container supports is structured to accept a first small-sized container. The second container support is structured to accept a second larger-sized container, relative to said first small-sized container. The carousel includes a product filling head above each of said first and second container supports. The first container support can be radially retracted from a side of the second container support and from beneath its corresponding product filling head to allow the second container support to accommodate a larger-sized container.