Ampules are smaller and used to hold single-dose medicines, whereas vials tend to be larger, and the product inside can be stored and reused. Clear Glass 12 x 32 mm Screw Neck Vial with Cap and Preslit PTFE/Silicone Septum, 2 mL, Pre-Assembled for Dissolution Systems, 100/pk. Store your analytes, samples, and solutions easily in the Clear Glass