Almost all tea bags that are purchased in a supermarket are inferior and contain the shake from tea leaf operations.
When loose tea is graded and packaged, there are little bits of "tea dust" left behind, no whole leaves. This bits are gathered and made into commercial tea bags.
They are still bits of green tea, but the quality is substandard to say the least. Try making your own green tea bags with whole leaf loose tea.
Your local tea shop will have fillable tea bags you can buy for just a few dollars and you can make your own high quality, superior green tea bags.