This unique design allows you to create a variety of different container sizes with interchangeable tops and bottoms, so you'll never search for a lid again. Set includes a total of 20 pieces, fourteen small sizes (1 cup) and six large sizes (2 cup) that can be used together to create up to three size configurations and endless, fun color combinations. All pieces nest together to keep your kitchen organized and help save cabinet space. Containers snap together and are great for a variety of uses including food storage, meal prep and lunches. All components are microwave safe, top-rack dishwasher safe and are BPA Free.