Each of the vegetable storage box designed with adjustable vents which can regulate the flow of air in and out controls the humidity inside, help prevent spoilage, keep fruits and vegetables fresh for up to two weeks for maximum freshness. The vegetable storage container is made of high quality and environmental-friendly Approved materials which are BPA free. The durable high-quality cover is both scratch and corrosion resistant and does not odorless. Safe for dishwasher. And look at the bottom, it can be drained directly.