@dougmerritt I learned about this about 30 minutes ago. This with quick googling:
It seems that the cellulose in 'paper' tea bags can be lined with polyethylene. The bag can also be heat sealed with heat-sealing agents and have adhesives that keep it in shape.
It seems that Lipton bags are mostly cotton and cellulose with small amounts of polypropylene or polyester fibers for strength.
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