Anchor Hocking Glass Food Storage Containers are made with Tempered Tough��� glass that is up to 100% stronger than regular glass and is Microwave Oven Freezer and Dishwasher Safe. TrueSeal��� Food Storage is the perfect meal prep container: prep bake and store all-in-one. And our TrueSeal��� lid is designed to prevent leaks and spills making it ideal for life on the go. Our food storage features a 5 year Warranty backed by our company.