Abstract: A shelving system that is assembled without the use of any hardware includes a first side panel extending in a vertical direction and including a first slot and a second slot that extend in a substantially horizontal direction. A second side panel is substantially parallel to the first side panel and includes a third slot opposite the first slot and a fourth slot opposite the second slot. A first shelf includes a first tongue and a second tongue. The first tongue defines a first key slot and the second tongue defines a second key slot. The first tongue extends through the first slot and the second tongue extends through the second slot to couple the first shelf, the first side panel and the second side panel. A first key is positioned within the first key slot and a second key is positioned within the second key slot.