18 oz. cups (532 ml). No. 1 party cup in America. Hefty.com. how2recycle.info. To contact us visit: Hefty.com, call: 1-800-433-2244 or write: Hefty Brands, PO Box 85583, Richmond, VA 23285-5583. Product made in the USA. Liven up any get together with Hefty Party cups, the #1 branded party cup in America!