Ozeri INSTAVAC Green Earth Food Storage Container Set are available in a variety of shapes, sizes, and colors and are versatile. If you want to use storage containers for something other than food or a gift for this gift holiday, it is recommended that the set of green food containers, which are the immediate empty freshness without pumps, motors, and confusing parts. Just press the center of the lid and the excess air is ejected through the unidirectional valve. This requires minimal effort. The patented valve easily removes excess air so that the growth of natural bacteria is greatly reduced and the food remains fresh longer. It also has a relief valve that prevents spills, splashes and breakouts when used in microwave ovens. The wavy pattern at the bottom of each container holds fruits and vegetables in water and juices, BPA-free, dirt-repellent, unbreakable and as transparent as glass.Also, they are freezer safe.