The air-tight storage jar includes a clear plastic (PS) container and a silicone lid. The specific design features innovative silicone lid that creates an instant air-tight seal. In operation for sealing, the silicone lid is put on the opening portion of container. The knob of sealing lid is pressed down so as to push out the part of air from the gap between the outward tilt portion and the annular border of lid, so that the air pressure inside the container is lower than external atmospheric pressure. Accordingly, facilitated with the external atmospheric pressure which is greater than the air pressure inside the container, the sealing lid is more closely sealed with the container. It makes an instant sealing, a perfect air-tight function. In operation for opening, the knob is squeezed or drop, the air-tight status will disappear. It is easy to remove the sealing lid and open the jar. It is a useful storage jar in kitchenware.
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