I measured 26-3/4 inches from the bottom of the seam connecting the hood to the jacket to the jacket bottom, which is curved slightly (longer in the center than on the sides, but not dramatically so). My measurement was along the center line (essentially along one's spine). Hope that helps. I haven't used this jacket much (it stays with my travel stuff, as opposed to my hiking gear), but when I did use it, it worked well. I'm 5-6.5.
Answered on 10/7/2016 2:03:47 PM by Edwards Hiker from Colorado
My size Medium measures 27.75 inches from the back neck seam to the tail.
Answered on 10/9/2016 7:36:58 AM by The Busy Professor from Takoma Park, MD