Abstract: A multiple-compartment container comprising: two or more panels sealed together to form a container; a supplemental cavity adhered within the container to one of the panels; and a burst seal on the supplemental cavity configured to release contents of the supplemental cavity upon application of force from a user. The multiple-compartment container can be efficiently filled by first filling the supplemental containers, then affixing the supplemental containers to a panel of the main container, next joining the panel with others to form the main container, then filling and sealing the main container.