Features: 1) Microwave storage box 2) Using plastic material 3) Can store food, keep fresh and cook food in microwave 4) With nice surface 5) Capacity: 670ml/1,150ml/1,500ml/2,100ml/3,000ml/4,000ml 6) Plastic keep fresh, vacuum box, food container 7) The quality of many foods deteriorates when exposed to air, mainly due to the humidity of the air. With the bergner vacuum box, all air sensitive foods, such as cookies, crackers, cereals and chips can be stored in a vacuum, keeping them fresh and crisp 8) Method of use: a) Put food in container and cover with lid b) Push the valve face down and secure lid using clip c) Put pressure on top by pressing down in middle d) To release pressure, lift the valve up