Glass was often the preferred material for storing expensive oils, perfumes, and medicines in antiquity because it was not porous. The small body and mouth allowed the user carefully to pour and control the amount of liquid dispensed. By the 1st century AD, the technique of glass-blowing had revolutionised the art of glass-making, allowing for the production of small medicine, incense, and perfume containers in new forms. Glass vessels are found frequently at Hellenistic and Roman sites, especially in cemeteries, and the liquids, which filled them, would have been gathered from all corners of the expansive Roman Empire. Aryballoi were small vessels used for storing perfumes and scented oils, and were made of blown glass. They are sometimes called oil bottles. More elaborately decorated, slightly larger and decorated examples of these oil bottles were called amphoriskoi and were produced by glassmakers in Syria and Palestine. Aryballoi of this type were also produced in Syria, and in the West.
To learn more about Roman glass, visit our relevant post: How It Was Made: Roman Glass.