Cook & Go lunch containers - Ready to take away right after cooking. You can easily transport home cooked meals for lunch at the office, potlucks or picnics anything is possible with the Pyrex Cook & Go lunch containers. Cook & Go airtight containers can also save you space in your kitchen closet since they containers are stackable. Made of borosilicate glass the Pyrex lunchbox is a food container that is oven , fridge, microwave, and freezer compatible. The lid is completly tight and leak proof due to it's high quality clippers/flaps. Transporting your lunch container has never been this easy!