Unbleached muslin bag with drawstring. Use when brewing a large pot of tea. I sometimes fill them with herbs & toss into the bathtub to brew in my bath. No loose herbs to clean out later! Spice bags make it easy to create bouquet garnis. Simply enclose a collection of herbs and spices such as oregano, sage thyme, basil, and parsley in the bag, pull the strings, tie and put in the pot.