Extremely durable: thanks to the use of high quality thick borosilicate glass, our storage containers are resistant to high and low temperatures from -40 to 360 degrees. Versatile: the containers are suitable for the oven, microwave (without lid) and even for the freezer. They are also environmentally friendly as they can be used multiple times. Easy to clean: the lockable container is made of materials that are BPA free and can be washed in the dishwasher. So you don't waste time washing dishes. Extremely practical: the tight lid clips provide excellent insulation and protect food from external agents, bacteria and accidental spills. In addition, the containers are stackable and therefore space-saving. MAKE YOUR OWN SET - You can choose between 12 volumes and 3 shapes (rectangular, square and round). So you can design your own individual storage container set.