What are vacuum-sealed bags, and why use them for tea?

Vacuum-sealed bags remove oxygen from the package before sealing, minimising oxidation and significantly extending the shelf life of tea. 

This technique retains aroma and freshness for long-term storage, prevents mould growth and discolouration, and reduces package volume for easier shipping. They are typically made from laminated films like PET/NY/PE or PET/AL/PE for strong puncture resistance.