I have these on hand from making raw sesame milk, almond milk, etc. for my daughter. I bought mine from ebay (4 for $10 total). They are awesome for straining out the pulp. I just put a third of a Watermelon into my vitamix (high water content, so I don't need the juicer), and then poured it into the bag over a pitcher. 6 cups of strained Watermelon juice. Then I poured the pulp back into the vitamix with some juice, threw in a few other pieces of fruit, and the family had smoothies for breakfast!