A shipping container storage system includes mounting posts that are mountable within the inner or outer channels along the corrugated side walls of a shipping container for supporting various load supporting accessories releasably along the mounting posts. A first mounting bracket configuration allows one or both ends of the mountings posts to be fastened to a perpendicular end surface at the top or bottom end of a channel receiving the mounting post therein. A second mounting bracket configuration includes a hook that allows the mounting posts to be suspended from a rigid anchor loop at a top end of a channel in the shipping container side wall.