NT-500 vacuum lunch box produced under the brand name BIOSTAL refers to the classic series. Flasks of this series are top sellers, they are easy to use, efficient and multifunctional. This lunch box is supplied with a handy pouch. Vacuum lunch boxes are designed to store hot food (mainly second courses), cold food (frozen food, ice-cream, etc.), fruit and ice. The stopper allows to keep heat longer due to additional thermal isolation. It is also equipped with a valve making it easy to open.