Spill-proof: The containers have liquid-tight lids. Gravies or other wet food items do not leak or spill even when container is tipped on its side. | Easy Open: The lids have prominent tabs to allow for easy opening. | Easy clean: The inner walls of the containers are smooth, making them easy to clean. | Portion Control: Can also be used to carry measured portions of food if you're on a portion control diet. | Material and Capacity: The containers are made of plastic and have a capacity of 120ml each.