Plastic tubs provide great storage options, but adding castors makes them even more useful. Castors are tiny wheels that fit on the bottom of a container letting you move it around instead of having to lift it. This simple change turns a fixed storage box into a flexible tool that you can push through cramped areas skinny corridors, and busy warehouse spaces. https://lifeexmedia.com/the-role-of-castors-to-enhance-efficiency/