Santiago is a regular co-pilot when I am out riding. We have done as much as 250 miles in a day. You can’t see it here, but his chest harness is attached to a lead that lets him move back and forth in the top-box, but he can not get “launched” out of the box! He can stand, sit, move left to right and even lie down. In fact, on long trips, he will take a snooze back there! (Some foam on the bottom helps dampen vibration.) Next up, I need to fab a windscreen for him.