The T-Sac is our own innovative filter for brewing high-quality loose tea. The T-Sac comes in four sizes, depending upon the cups of tea. The amount of tea inside the sac can be adjusted to preference. To make a cup with loose tea, the sac -- made from unbleached, chlorine-free paper -- can be filled with one or multiple kinds of tea through a slide opening, which allows for easy filling. After the sac is filled, fold or twist the top and dispose of the sac after brewing. When brewing, the T-Sac has an expanding base to support the sac without a filter holder.