T-Sac filter No.4 for 6-12 cup teapots, up to 12 teaspoons of tea. Enjoy loose tea much more easily versus using a traditional tea infuser. Convenient for home, work and travel. T-Sac filters are great for the environment too, made with biodegradable, unbleached manila hemp. T-Sac is an all natural, chlorine-free, 100-percent biodegradable hemp sac for brewing loose teas. T-Sac can also brew coffee (dependent on the grind).