I love these because:- the bowls nest very nicely in the cupboard- they stack perfectly in the frig with the lids on too- don't stain from greasy foodsOther reviewers said that the plastic bowls don't stain from pasta sauce. I just tested it. I stored a meaty pasta sauce in one of the bowls for a couple days. I put the bowl in the dishwasher still a little greasy and orange-colored. It came out without trace of the grease or color. Awesome.