No, it is a metal one. It is designed for a kid's lunch. My kids like to take hot food to school, such as macaroni and cheese, soups, or ravioli to break up the monotony of PB & J sandwiches, so I bought a few of these... they are Thermos brand, so I know they are good quality and obviously air-tight, or the fermenting gas would have escaped instead of blowing the lid off.