
Tea bag patents date from 1903 when Roberta Lawson and Mary McLaren, of Milwaukee, Wisconsin, were granted US patent 723287 for a Tea Leaf Holder, which they had filed in 1901.
Tea bags are commonly made of filter paper or food-grade plastic, or occasionally of silk cotton or silk. The tea bag performs the same function as a tea infuser. Tea bags can be used multiple times until there is no extraction left. Some tea bags have an attached piece of string with a paper label at the top that assists in removing the bag, while also displaying the brand or variety of tea. There are also special tea filters that can be used to pour loose tea into and brew it in a bag in a cup.
Organic tea companies seem to be the most conscientious about what material is used to make their tea bags. Yogi Tea, Numi Tea, EDEN Organic, Organic Traditional Medicinals, and Two Leaves Organic Teas all have plant-based tea sachets. All of their tea bags are plastic-free and compostable.