Here is a set of two Bodum Canteen 3 oz. glasses. The perfect size glass for that double espresso.
The style is contemporary and the double wall glass insulates very well. With my steaming hot double espresso in hand, it was mildly warm to the touch. It's made with mouth-blown Borosilicate glass by expert artisans.
The Borosilicate glass is amazingly durable...something about the glass particles being closer together to make it stronger than traditional glass. Because of this, these glasses are more resistant to temperature swings and scratching.
They are also dishwasher safe, microwave safe, and will not become cloudy over time.