A process and apparatus for preparing a multi-compartment container having two open ends and a partition wall that forms a fluid-tight seal defining two compartments each holding a separate component to be mixed with one another by the end-user prior to use. The process and apparatus for filling the two-compartment container comprises filling one compartment with material through an opening at one end of the container; sealing the opening; rotating the container; filling the other compartment with material through an opening at the other end of the container; and sealing the other opening preferably with a removable seal.