Rubbermaid Premier Containers are made with Tritan plastic that resists stains and odors. The easy to use Flex & Seal lids snap and seal in an instant, while also snapping into each other for easy, space saving storage when not in use. The crystal clear vessels are perfect for easy visibility of the contents in the container, and the square shape allows for easy stacking and storage in the refrigerator. 18-piece Set Includes: 1- 9.6 cup container 2- 4.7 cup containers 2- 3.2 cup containers 2- 1.3 cup containers 2- .5 cup containers Features: 100% Leak-proof Guaranteed Crystal-clear, BPA-free Tritan lids and bases Splatter-resistant microwaving with built-in vents under latches Stain and odor resistant Stacks perfectly to one another Dishwasher, microwave and freezer safe