18 oz. (532 mL) double wall vacuum insulated water bottle._x000D_ . Made of 304 Stainless Steel interior and 201 Stainless Steel exterior with Polypropylene Plastic sipper cap and PE Plastic straw._x000D_ . Twist-on cap with hook for easy carry and integrated flip up sipper straw._x000D_ . The flip up sipper cap includes a finger pull to keep spout touch free and sanitary._x000D_ . Vacuum insulation helps keep your beverages colder longer than non-vacuum insulated bottles._x000D_ . Designed for use with cool beverages only. Perfect bottle for your go-to adult beverage._x000D_ . Hand-wash only._x000D_ . Do not microwave. Do not place in freezer.