Ken - Vintage - Regular (12 3/4" Box) (EXAMPLE)

The 12 3/4" is the best fit for vintage Ken dolls.  The arm holes are designed to hook mid-arm so that they minimize how much they might wrinkle his short-sleeved shirts.  

Getting his legs through the lower can sometimes be a bit of a squeeze but once his calves are through he will sit nicely and not move in shipping.  

Note: We found using tiny baggies such as the small ones that come with our fashion boxes over painted hair Ken dolls helps prevent potential rubbing.