There is a bag system, comprising: a main bag, including a front side, wherein: a slit is disposed along the front side; and a buckle is coupled to an interior surface of the front side; and a supplemental bag, removably coupled to the main bag, and including a connector, wherein: the connector is disposed along a back side of the supplemental bag; and the connector is disposed through the slit and removably coupled to the buckle, the connector and the buckle thereby comprising a latch assembly.