Milton Thermosteel Plain Lid Flask, 500ml,Plain Steel Color Key Features:  500 ml capcity Keeps your beverages hot and cold for 24 hours  Sturdy steel flask with a simple tik-tok lid  100% rust free and leak resistant  Fabricated inside and outside in 18/8 quality stainless steel The Classic Milton Thermosteel Flask is a vacuum insulated flask with inner and outer steel. It is desgined to keep your beverages hot or cold for 24 Hours. It has a unique tik-tok lid makes pouring completely hassle free and spill free for you. The lid of this flask also serves as a cup for drinking.