In other currently-preferred embodiments of the present invention, the vial bodies are made of a thermoplastic material, such as the thermoplastic material sold under the trademark TOPAS by Ticona Corp. of Summit, N.J. In some embodiments of the present invention, the TOPAS??? material is sold under any of the following product codes: 5013, 5513, 6013, 6015, and 8007, and is a cyclic olefin copoly