A locker bank system for expanding the capacity of a fixed locker bank having monitors when the number of available lockers drops below a predefined threshold capacity at the fixed locker bank. In response to this trigger, a mobile locker bank is automatically routed to the fixed locker bank to increase a number of available lockers at the location. A computing system at the fixed locker bank and the mobile locker bank are adapted to control access to the fixed and mobile locker bank lockers. Each locker bank further includes a communication system that is adapted to facilitate direct or indirect communication between the fixed locker bank computing system and the mobile locker bank computing system when the mobile locker bank is positioned adjacent the location of the fixed locker bank. Together the fixed locker bank and the mobile locker bank may function as a unitary locker bank.