Sometimes a little more ice cold water is a little better. our 18 oz Bottle is the perfect size to keep by our side and sip on all day replenishing fluids as you bike to work, hit the gym at lunch, or hang with friends after a long day at the office. Fill it with our favorite, and it stays cold up to 24 hours or hot for 12 hours. Durable 18/8 proGrade Stainless Steel construction. BPA Free and Phthalate Free.