Great stuff but very expensive. I hesitate to use it because of its cost, which is around $2.50 for a little package roughly the size of a restaurant ketchup pack.

I love this filter. I can brew a cup of coffee anywhere there is hot water available. I bought one to keep at work and later ordered another to use at home when I want only one cup. Only down side is a bit of sediment in the bottom of the cup if you don't use custom coarse ground coffee. Just don't drink it down to the last drop if that's the case.