KlokenTainers™are freezer, microwave and dishwasher safe. They are made from BPA-Free “Tritan” plastic which is impact resistant, 100% recyclable and more transparent than glass. KlokenTainers have gracefully curved corners, sloping sides and an eligantly rolled up top edge making them beautiful enough to double as a table-ready serving dish. KlokenTainers have four integrally hinged snap/lock flaps on a clear plastic lid which, when engaged in the closed position, form an air and liquid tight seal.