Aside from being able to sit on the counter without tipping over, double-spouted portafilters are also used to "split" a double shot into two single shots. In a busy cafe or home it's usually not feasible to change the grind back and forth for single and double shots, and splitting a double is much faster than pulling two singles. A split double doesn't taste the same as a true single, but most customers won't notice. That's what the Decent Espresso Double Spouted Portafilter does. It's "The Portafilter" for you.