hermos Stainless Steel SS304 Flip Lid Vacuum Flask with 24 Hours Hot/Cold Insulated Thermosteel. Saaj Oxygen Thermos comes with unique flip lid that makes pouring liquids hassle free and spill free. It is a vacuum insulated specially designed to keep your beverages hot and cold for 24 hours. It is a very handy bottle specially designed for carrying with you alone at the time of travelling.The best way to remind yourself to drink water is to carry a bottle with you