I was just wondering if any one upgraded to the newer smaller version of the vest. My daughter has the older version of the vest . I think it might way 50 pounds not sure, but it is heavy to lug around. I'm grateful that we have one period, because I know that there is still people out there that dosen't have a vest. Is there a way you can trade in the old vest and pay less for a newer version? If anyone has done this how much did it cost you.?