Thermos large, 26-ounce stainless steel hydration bottle is made with thermax double wall vacuum insulation for maximum temperature retention and is bpa free. Designed to keep drinks refreshingly cold for up to 18-hours. Made with unbreakable stainless steel interior and exterior, with a "sweat-proof" design: it won"t leave water rings. Twist off lid protects spouts from dirt and germs. 26-ounce capacity is ideal for water, iced tea, juices or sports drinks.