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It came as a surprise to most people to learn that tea bags contained plastic. The plastic in question is polypropylene, which seals the tea bag and helps the bag retain its shape in boiling water. Is this important for the tea taste? Not really – it is said to let the tea move around more freely and brew more quickly. So, if you would rather not put plastic in your compost heap or just want to dispense with single-use plastic, what are your choices?