Finally, a vacuum insulated stainless steel water bottle that's easy to clean! Just twist to remove Riley's base to easily clean the inside of your bottle and add ice. This 18-ounce vacuum insulated stainless steel water bottle keeps drinks cold up to 24 hours. Riley's leak-proof threaded lid features a built-in silicone carry loop for carefree transport. All parts of the Riley are BPA free. Recommended for use with cold beverages only.