Most tea bags that you purchase anywhere use some level of plastics in their component materials and/or binding (especially this latter). The only safe options

Most tea bags that you purchase anywhere use some level of plastics in their component materials and/or binding (especially this latter). The only safe options are metal strainers that you filter the tea with (and that hopefully don't have coatings on them that are harmful... boiling a new one would not be a bad idea before first use) or just loose leaf.