The STACK RACK XXL+ GRID BACK WALL is an optional add-on panel that attaches to the back or front of the STACK RACK XXL+ to create a secure barrier along the long side. One grid panel is already included with the STACK RACK XXL+; this product is for users who require a second panel to enclose both sides. Designed for permanent or semi-permanent installation, the grid wall attaches without tools during assembly and is not intended for frequent removal or daily access. It provides added containment while allowing airflow and visibility. For flat pack efficiency, only one grid panel fits within the STACK RACK flat pack.