Source: http://gizmodo.com/a-double-duty-flippable-mug-holds-coffee-or-espresso-1651388318
If your office doesn't pay for a cleaning service, and every employee is left to wash their own dishes, you'll want to maximize every cup, plate, and spoon you bring to work. So when it comes to caffeine you might want to swap your current mug for this $14 double-duty alternative that holds 5.5 ounces of coffee, or 1.5 ounces of espresso when flipped upside-down.