All modules are a uniform 600 mm width & in a choice of heights and depths. Systems can comprise containers of the same size, or a combination of various sizes. They can be configured as a freestanding unit, as a fixed wall unit, as a mobile trolley unit, or as a portable hand held unit. The clear, unbreakable polypropylene compartments are tipped forward 450 for easy filling and withdrawal. They are easily removed & can be cleaned with soap and water.