I bought this filter with my new Single Serve Mini (Oasis). After removing the plus series adapter, the filter was both too tall and too wide to fit into the mini. The top wouldn't close with this filter inside, no matter how many times and ways I tried to insert the filter. The single serve cups are a tight fit but they work. I returned the reusable filter to the store and am hesitant to try it again. Giving it an extra star for the idea of a reusable filter, which is why I bought a Keurig in the first place, but until I can be certain that a reusable filter will fit, I seem to be stuck using single-use.