Our hay bags are made  of cordura nylon and have 2 d-rings on the top to hang in your trailor or stall.  The length is 20 inches long from the D ring, and 18 inches wide at the top and tapers down to 14 inches wide at the bottom.   The diameter of the hole for eating hay is approximately 6 inches.  Made in the U.S.A. by Nanci.