A unified container includes a plurality of individual storage units that are interlocked, each storage unit including at least one compartment and at least one lid. Each storage unit further includes an interlocking mechanism, for example, a tooth and groove mechanism. Through the interlocking mechanism each storage unit interlocks to adjacent storage units, thereby forming the unified container. However, the interlocking mechanism also allows each storage unit to be detached from adjacent units and thereafter reattached/interlocked with any other unit, thereby forming unified containers of varying sizes. According to one example application, the interlocked storage units form a pill case, each unit holding medication for a different week-day. Through the interlocking mechanism, users can detach one or more storage units and take them as they travel, the individual units being easier to carry. Thereafter, the detached units can be reattached and reused.