1790 Flip Top Containers are airtight, liquid safe and stackable, which make it easy to store food and keep the kitchen organized. Creating an airtight seal is as simple as flipping the tab on the lid down. When it comes to modular stacking, the clever rectangular and square design of the containers make storage simple and efficient. The containers are thoughtfully designed to fit common kitchen staples like a 5 pound bag of sugar, pasta, box of cereal and more. The BPA free construction of these containers ensures that food is stored in a toxin free environment.