A cargo container having a floor and a peripheral wall structure and including a plurality of side post assemblies. Each side post assembly has a body with a vertically extending length. The body of each side post assembly is secured at the outside surface of at least one of the panels. Each side post assembly further has a reinforcement plate with oppositely facing first and second surfaces. The first surface is facially abutted to the outside surface of the at least one panel. The body of the side post at least partially overlies the reinforcement plate. A logistics slot is formed in one of the side post assemblies.