These work PERFECTLY in a Keurig coffee maker and they are much easier to use than the k-cup holder that requires you to take the widget out of the coffeemaker first. These are used just like a k-cup--fill and use, then rinse. They've held up well. It comes with 4 so you can have them at work, at home, for camping and a spare.
If you are a kuerig owner I recommend buying this little money saver device. If you don't mind loading it up with ground coffee and then cleaning it afterwards then this is for you. Owning one of these also gives you the chance to make coffee for brands that don't exist in K-cup form. I know K-cups are supposed be quick, simple, and chore free but that comes at a cost. If you want to save money and use whichever brand of coffee you like buy this product.
This is not as quick or convenient to use than the pre-made kcups but only adds an extra minute if that. Great way to cut cost,too.
I use them over and over and enjoy my keurig
I like the product, saves me money and I get the type of flavor and strength I want in my cup of coffee. I bought some for my daughter.