I do this with the small things that I need to buy, keep one roll of toothpaste (or whatever) that is being used, another in a cupboard. As soon as you take one

I do this with the small things that I need to buy, keep one roll of toothpaste (or whatever) that is being used, another in a cupboard. As soon as you take one out of the cupboard, buy new one to put in the cupboard.