Here is a guitar designed with travel in mind. The Traveler Guitar 6 String Pro Series has a one-piece maple neck-through-body and gives you the same playing area as a standard guitar in a more compact body. It produces beautiful electric and acoustic tones. Simply bring your amplifier or the included stethophone headset and you are set.
This guitar measures 30 inches long, weighing less than 4.5 pounds. You can find out more about it here.