The Milwaukee Tool PACKOUT Modular Storage System is an attachment system which allows boxes, organizers, and totes of multiple sizes and configurations to stack and lock together. An intuitive and quick attachment mechanism gives users the freedom to stack and lock PACKOUT tool boxes, organizers, and totes of different sizes in numerous configurations that best suit their needs. The initial PACKOUT Modular Storage System will consist of eight products – three toolboxes, two organizers, and three storage totes.