Made with 100% pure platinum food-grade silicone, BPA, BPS and plastic free. Sized for boiling and sous vide cooking. STASHER offers all the ease and convenience of plastic storage bags but without the harmful effects. Unlike plastic bags stasher contains no petroleum, no PVC and no latex, so it's good for us and our planet. This easy-to-clean reusable bag is freezer, oven, stovetop, microwave and dishwasher safe.