Abstract: A stackable equipment container includes at least one reinforcement panel made of a composite material attached to the container on an interior surface proximate an arrangement of stackable elements. The panel is attached to the container using spin-weld plugs installed at a high rotation rate. Through the installation of the spin-weld plugs, the panel becomes fused or welded to the container. In one embodiment, the rotation rate of the spin-weld plugs during installation is sufficient to cause the panel and container to locally vulcanize with each other and with the spin-weld plugs. The panel provides the container with increased strength and operates to minimize or eliminate distortion of the stackable elements.