When it comes to bunching greens, there is no definitive answer as to how big the bunch should be. This will ultimately depend on the type of greens being bunched, as well as the preference of the person doing the bunched. For example, if you are bunching kale, you may want a smaller bunch than if you were bunching Swiss chard. Ultimately, it is up to the individual to determine how big or small they want their bunches of greens to be.