Zip Top is reusable containers that made with 100% platinum silicone which means they are endlessly reusable, food grade, microwave, dishwasher, oven and freezer safe. They are completely food safe and can be microwaved and heated up to 425°F and they also can be cleaned easily in the dishwasher. Zip Top containers are built to last and can potentially be used thousands of times replacing disposable plastic bags and containers which will reduce waste.