For many, the YerbaCup is the easiest way to enjoy the traditional method, because it includes a built in gourd and bombilla, as well as the added benefit of a built in water chamber (thermos that "serves" the water onto the Yerba Mate in the gourd). It is convenient for travel or work.  Use with care, as green cup does not lock into place.  It is best to pick up by bottom to avoid damage.
Other YerbaCup information available at www.yerbacup.com.