These convenient tea filters are perfect for brewing loose leaf tea, keeping your leaves separate from the liquid while still allowing them room to expand and unfurl. Just fill a sac with a teaspoon of your favorite tea and drop the sac into a cup of hot water, just as you would a tea bag. Each box of T-Sacs comes with 100 individual filters. Biodegradable and disposable, they are ideal for on-the-go tea enjoyment or for brewing one cup at a time. Size Guide...#1 - Single Cups (6-8oz) #2 - 12oz or Larger / Single Cups of Bulky/Fluffy Teas #3 / #4 - Good for Brewing Large Batches of Tea (24oz or More)