The Fresh & Save vacuum containers are designed to work with the vacuum pump to keep food fresh up to five times longer than non-vacuum storage. The set includes 2 small containers ideal for diced vegetables, fresh herbs, and leftover grains, plus 2 generously sized large containers with plenty of room for family sized portions and hearty leftovers. With the Fresh & Save system, you can shop once a week and refrigerate or freeze fresh fruit, vegetables, meat, and fish in our vacuum containers and bags and enjoy the benefits of your own fresh market at home. Prepare your meals days in advance and enjoy them as fresh as the day they were cooked. Here's how it works: Dock the vacuum pump onto the container or bag valve and at the push of a button it extracts the air in mere seconds. It stops automatically once a sufficient vacuum has been obtained, locking in flavor, aromas, and vitamins. Set includes: 2 small glass containers, 2 large glass containers. Containers temperature resistant from 0°F to 536°F. Freezer safe, ovenproof (without lid), microwave safe (without vacuum seal), and dishwasher safe. All container sizes are nestable for easy storage. Container lids feature double seal to create a perfect seal. Doubles as a serving dish at the table. Materials: BPA-free, borosilicate glass (base), plastic (lid), silicone (valve, seal)