With roots reaching back to the early 1900s, Clarke Container manufactures and distributes prescription packaging for pharmacies and veterinary practices from its Erie, Pennsylvania operation. The company is best known for its patented Green Neck prescription vial, developed after World War II as a child-resistant design that adults— including seniors and people with limited hand mobility—can open with one hand. Clarke Container also supplies related medication bottles and dispensing packaging, with many vials made in the United States by sister company Pinnacle Plastics using FDA-approved materials.