Santana Outdoors Report post Posted June 6, 2013 Similiar to the Eberlestock X3 is the X4. The X4 by Eberlestock is a superior 1 to 2 day pack. With its design it rides tight to the body and contours to maintain a low profile, making it sleek. If your looking for the emergency grab-n-go bag, this is a great candidate. Please "like it " on youtube for us if you feel we did a great job. For More specific information please visit http://www.santanaoutdoors.com/servlet/the-54358/Eberlestock-X4-Highspeed-Pack/Detail Rhett Connolly Santana Outdoors Share this post Link to post Share on other sites