GS1 has a good illustration on Packaging levels are required for Good Manufacturing Practices (uses in pharmaceuticals, medicine and food industry). Source: https://www.gs1.org/docs/healthcare/position-papers/Discussion-paper-on-medicines-identification-requirements-on-primary-level-packaging-using-GS1-standards-final.pdf
I’m still not sure how ERPNext can implement packaging levels for better identification and traceability in the virtual world.