Instant vacuum freshness without pumps, motors or confusing parts; Simply press down on the lid and air is forced out via the one-way valve;Patented valve removes excess air to reduce naturally occurring bacteria; It also releases pressure to prevent spills and splatters in microwaves;Wave pattern on bottom of each container keeps cut fruit and vegetables elevated from water and juices;Handy date dial allows you to record when food was first stored and monitor days kept in the refrigerator;BPA-free, stain-resistant, shatter-proof and as transparent as glass; Freezer, microwave and dishwasher safe; Satisfaction guaranteed