20 oz. Double Wall Insulated Acrylic Tumbler - RattlesnakeConsumers have found that the standard 16-oz. capacity is too small to accommodate their beverage along with ice. So we have developed our series in a more effective 20-oz. size. It's the same great item with the right capacity! Each tumbler includes a screw-on lid and sturdy reusable acrylic straw.Made of Food Grade Plastic.BPA Free - FDA ApprovedFor use with COLD beverages ONLY.NOT for use in Microwaves.