The large bin on top is designed for carrying a tool bag or other supplies and two of the three large 13.5" x 12.5" x 4.5" professional grade parts boxes include removable bins that are sub-dividable for customizable parts organization.
This cart provides built-in security with a locking top cover, parts boxes that lock into place and an attached cable that allows the whole cart to be secured at a particular location.
Pictured: FC-50TBNT (tool bag, no tools)