Glass containers would not be an option. Monte Testaccio is maar up of globular amphorae of the type Dressed 20 (link at the end). Which is the largest type of amphorae, holding up to 80 liters. There's no way to make glass vessels of that size (in Roman times) they did use smaller glass bottles for oil that was perfumed.

The globular shape meant that reuse was impractical. Smaller allongated amphorae (the form most people think of when amphorae are mentioned)could see reuse as roofing tile, however they didn't hold the same volume.

https://www.sal.org.uk/collections/explore-our-collections/c...