An electric bicycle includes at least two internal storage compartments accessible by moving a seat to an open position. The storage compartments are arrange side-by-side and separated by a dead space (e.g., a wall). The electric bicycle includes a lock mechanism disposed in the dead space for selectively locking the seat in a closed position. As so arranged, the lock mechanism does not reduce the size of the two internal storage compartments and is less likely to be tampered with in comparison to lock mechanisms that are located around the perimeter of the storage compartments.