I bet it would be pretty easy to put a back vent in it. That's what my Showers Pass has, it's just a slit straight across the whole back, I _think_ with one attachment point in the center, but maybe not, and the slit is at the level of the center of my shoulderblades. There is mesh on the inside of the slit. Air scoops in through the neck, and out the back- it works great.