The Vacuum Flask Tea Infuser from Full Leaf Tea Co. is a convenient and effective way to brew and drink tea on the go. The article explains the steps on how to use the product. Firstly, remove the bottom compartment and add loose tea leaves. Then, reattach the bottom compartment and pour hot water into the top section. Allow the tea to steep for the desired amount of time, then twist the lid to strain the leaves and enjoy the freshly brewed tea.