The Revolutionary Way for Mailing and Storing Samples Boxes - Made from polypropylene, envelope shape, available with or without an inner frame. These boxes are the safest way for mailing or storing fragile samples. They are impact and shock resistant With a living-hinge, opaque-clear, reusable and recyclable. The boxes are available in many sizes and styles to fit your needs. Closing Clips and Security Seals are also available as an option. With 8 round cavities 0.94x0.62" for storing vials DB20, OD: 5.31x3.89x0.70", ID: 4.33x2.