some boxes have a lot of small compartments which is great for storing screws, nuts and other small items but can leave little room for larger items like hammers and wrenches. small drawers and pockets in a tool box are a fantastic feature to have as they can keep your tiniest bits and pieces from getting lost in the mix of larger ones, as well as giving you a cleaner and more organized work space. often times you will find a tray included in your tool box. if the tray is removable then you can adjust the compartments based on the job at hand. outer compartments also help you get 