The Keurig K-Express is a pretty reliable and transportable coffee brewing machine being 6.5 inches wide. You can fill up the water reservoir up by 36 ounces and you can have it pour out 3 different cup sizes, which are 6 oz, 8 oz, and 10 oz. Since the reservoir is small it's easy to clean. It’s a fast coffee brewer too. The wire is a bit short, but I use a cable extension so I don’t mind that. I use it in the morning and it helps keep my morning routine fast.