What thickness is appropriate for the cabinet body back panel?

The choice of back panel depends not only on thickness but also on the fixing method: slot-in and batten-fixed types have different thickness requirements, and for areas against the wall, wall flatness and moisture protection also need to be considered. For parts of the cabinet body that need to bear load or support hanging items, the focus is on adding bracing and reinforcement rather than simply making the back panel thicker. The proposed solution will specify the method used.