A system for independently routing vehicles and delivering containers and closures to a unit operation station (84, 86, 88, 90), said system comprising: at least one container for holding a fluent material, said container having an opening; a closure for selectively sealing said opening of said container; a track system; a plurality of unit operation stations (84, 86, 88, 90) disposed along the track system, one of the unit operation stations being configured for applying said closure onto said container; a plurality of vehicles propellable along the track system, wherein: each container is disposed on a respective vehicle; and the plurality of vehicles are independently routable along the track system to deliver at the least one container and at least one closure to the at least one unit operation station for applying the closure onto the container, characterized in that the system comprises a plurality of first containers wherein each first container has a shape and a volume and a plurality of second containers wherein each of said second containers has a shape and a volume that is different from one or more of a shape and a volume, respectively, of said first containers, and wherein the system is configured so that the container and the closure travel on the same vehicle to the at least one unit operation station. at least one container for holding a fluent material, said container having an opening; a closure for selectively sealing said opening of said container; a track system; a plurality of unit operation stations (84, 86, 88, 90) disposed along the track system, one of the unit operation stations being configured for applying said closure onto said container; a plurality of vehicles propellable along the track system, wherein: each container is disposed on a respective vehicle; and the plurality of vehicles are independently routable along the track system to deliver at the least one container and at least one closure to the at least one unit operation station for applying the closure onto the container, characterized in that the system comprises a plurality of first containers wherein each first container has a shape and a volume and a plurality of second containers wherein each of said second containers has a shape and a volume that is different from one or more of a shape and a volume, respectively, of said first containers, and wherein the system is configured so that the container and the closure travel on the same vehicle to the at least one unit operation station. each container is disposed on a respective vehicle; and the plurality of vehicles are independently routable along the track system to deliver at the least one container and at least one closure to the at least one unit operation station for applying the closure onto the container, characterized in that the system comprises a plurality of first containers wherein each first container has a shape and a volume and a plurality of second containers wherein each of said second containers has a shape and a volume that is different from one or more of a shape and a volume, respectively, of said first containers, and wherein the system is configured so that the container and the closure travel on the same vehicle to the at least one unit operation station.