Ideal for snacks, dry ingredients, or even leftovers, this set of square containers in five convenient sizes is perfect for getting cupboards organized or for bringing extra ingredients or side dishes to picnics or barbeques. Lock & Lock's patented 4-hinge locking system has been durability tested to last up to 3 million uses, and the enhanced silicone seal is 100% airtight to keep foods fresh longer and 100% leak-proof to prevent messy drips and sloppy spills.bpa-free construction provides a healthy, versatile, and convenient storage solution for the refrigerator, freezer, pantry, or anywhere your foods need to stay fresh and organized. Plus, the containers are dishwasher safe for quick and easy cleanup.