The ever iconic US Army issue poncho liner. Also, known more casually as a woobie. The idea being these could be used in conjunction with a poncho to create a improvised shelter, sleeping bag, you name it. 

These particular ones are in the Army UCP pattern, also known as ACU. We also have them for sale in OCP Scorpion. OCP Scorpion is the replacement for OEF CP, better known as Crye Precisions Multicam. 

Brand new, straight from the US Government carton. 

Roughly measures 7 feet by 5 and a half feet. They are not perfect squares, more of an oblong trapezoid.