Reusable Snack Bag with pinchpress seal, platinum silicone, BPA and BPS free. The innovative pinch press? seal makes this bag airtight and leak-proof. Made of 100% pure platinum food-grade silicone, 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. Freezer, microwave and dishwasher safe.