Momshopper 2 from Tampa, FL says: Do not buy this product because it does not fit. She is absolutely wrong -- not only does it fit all K-cup coffee makers but also works better than the Keurig filter system. Perhaps the reason it would not fit for her was because she tried inserting this filter into the K-cup holder that came with the coffee maker. This Medelco Universal Single-cup Coffee Filter System (when compared to the Keurig filter system) has a larger filtering screen allowing to make stronger coffee (if desired) and a longer funnel to help eliminate water overflow. I also like the idea of two filters so that I can use one while the other is in the dishwasher.