NB bullet shape vacuum flask 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 flask is designed for hot and cold beverages (tea, coffee, etc.) and supplied with two stoppers (the second stopper as a free gift). A plug stopper is reliable, easy to use, allows to keep heat longer due to additional thermal isolation. A handy stopper with a button allows to pour beverages to the cup without unscrewing the stopper, you just need to push the button.