Most commercial mass produced tea in tea bags are low-grade, poor quality dust and fannings from broken tea-leaves.  Essential oils are lost, releasing more tannins, resulting in a bitter, one dimensional and astringent brew. Often, tea bags are made with bleached paper material that can add harmful chemicals. 

Brewing a cup of tea with handpicked, high quality whole leaf loose teas allows the tea-leaf to infuse with the water and expand, adding more flavor and essential oils, which extracts essential vitamins and minerals.