The high-quality food grade Therma vacuum insulated flask is now more stronger than before. The lid is is made of 304 grade stainless steel that can be opened with a simple rotation and also can be used as cup for tea. Nanobot Therma can keep your drink cold upto 24 hours and hot for upto 24 hours. Nanobot Therma is BPA- Free, made with the food grade 304 stainless steel. Powder coat finish is durable and safe for people and the planet.