I bought these thinking they would only be used when I had a lot of people over and needed more than my "expensive" reusable K cups. I was wrong! These work every bit as well! The O rings keep them from leaking and the mesh is very fine so no grounds in my cup! But what I like best is that I can fill several in the morning and put them in my K cup dispenser, keeping the clutter down on my counter (see photo). Over all, I'm very impressed with these.
Susan A. Lisitza