I've tried a lot of reusable k-cups in search of cost savings and environmental awareness. I always ended up with coffee grounds in my cup. But, I thought I'd give it one more try…
I googled “Best Reusable K-Cup” and came up with this result:

I put it through a stress test with my normal amount of coffee, about five cups and I am happy to report… NO COFFEE GROUNDS!
I am so pumped! And now, instead of the landfill, my grounds are going straight into my compost bin.
If you're looking for the convenience of a Keurig, the cost savings and variety of ground coffee, and an environmentally friendly filter pod, this ticks all the boxes.
Happy caffeinating everyone!