AeroPress

Technically not an espresso machine — the AeroPress maxes out at about 1.5 bars of pressure versus espresso's 9. But the "espresso-style" concentrate it produces is so good that the World AeroPress Championship attracts 60+ countries. Invented by Aerobie frisbee creator Alan Adler in 2005, the $40 plastic tube has sold over 100 million units and spawned a cult following of engineers who share recipes like wine nerds share tasting notes. It's indestructible, weighs 6 ounces, and makes the best coffee-to-cleanup-effort ratio of anything on this list.