Rubbermaid FreshWorks Produce Saver Food Storage Container, Small, 2.5 Cup, Green 1920480

The square shape allows you fit so much more food into a deep, square pan. Where you might only fit three chicken breasts or pork chops,for instance, in a round pan, you can fit a full four (or more) in a square-shaped pan of the same capacity. This makes it easier and more efficient to cook for your entire family all at once.