I shipped an item via EBay in a box that I purchased that was labeled by the manufacturer as size 20” x 20” x 4”. EBay informed me that UPS charged me an additional fee, because UPS said that the box was 20” x 20” x 5”. I have used the same size box from the same manufacturer before when I shipped by FedEx - no problems. So - it seems that UPS up-charged me for their benefit.