Starbucks Recycled Glass Cold Cup, 20 Fl Oz A beautiful glass version of our iconic Cold Cup. Enjoy favorite iced or blended beverages in this 20 fl oz cup made of 50% post-consumer recycled glass. The glass press-in lid features a silicone seal, and the reusable plastic straw stays attached to the lid. Embossed Siren on front, fill lines on back. For cold beverages only. Dishwasher safe. Do not microwave.