This set includes sizes, such as 1-cup and 2-cup square containers, and larger round containers. It features an airtight four-hinge locking system with leak-resistant silicone seals. It is BPA-free and safe for dishwasher, microwave, and freezer use. The price drops from $73 to just $25.93. Free shipping on orders over $49, otherwise it adds $10.95.