The TSAC-4 -- Disposable biodegradable empty tea bags. There's a pocket and a large flap, and you simply put a spoon or two of tea into the pocket and wrap the flap over it and put it in your pitcher. This is a larger size than you need to make a cup of tea -- it is designed for making large amounts of tea (ie, a 1/2 gallon)
You can now make pitchers of iced tea using loose tea with NO mess, NO hassle -- in about 15 seconds you pull out a tea bag, fill it, and drop it in your pitcher. Pour in hot water. Done.
When the tea leaves are done steeping, you pull the bag back out and put it in your compost.
There are a few brands of empty tea bags on the market, but this is my favorite brand because they are over-sized, which allows a tea like an oolong or bud enough room to unfurl and steep properly.
You get 100 filters in each box.