Small portable toolboxes are sometimes called hand boxes or portable tool storage. Most portable toolboxes have one handle on top and a lid that opens on a hinge. Many have a removable tote tray that sits on a flange inside the lip of the box, with a single larger compartment below. The tote tray helps organize smaller parts and accessories. Portable toolboxes sometimes use slide-out trays or cantilever trays in lieu of the removable tote tray. Metal toolboxes (typically steel) weigh more than plastic ones. A plastic toolbox laden with tools can weigh the same as a comparable steel box does when empty. Metal boxes are also subject to rusting and their sharp edges can mark the surfaces of things they are banged against. Metal is, however, known for being stronger than plastic, so one should balance its disadvantages against the need to withstand abuse and support the weight of many tools.