Aeropress

Estimated price: $32 (check price)

Easy, light weight, and versatile are a few words to describe the Aeropress.  It uses immersion and pressure to create a great espresso.  Also, you can dilute the espresso with hot water for a great Americano.  Great for camping and traveling.

Pro Tip:  
When combined with a Hario Slim grinder, you have a great setup for backpacking.