Glass containers for storing food can be used in various ways. They are durable and come in different shapes and sizes. A set of airtight containers with lids includes rectangles, squares, and rounds. They are made of borosilicate glass and can withstand extreme temperatures. The silicone seal and secure hinge clips on the containers make them airtight and leakproof. The glass tupperware is packaged securely and comes with a 12-month warranty.