I've bought and sold many things online, but I'm stumped on the best way to ship a tripod. Its the 503 manfrotto tripod with legs, so its not small... any suggestions?
Take it to FedEx, put it in a box and fill that box with packing material. Also consider wrapping the tripod in bubble wrap. They should have a box that is close enough to work. If not go to a box or moving/storage vendor. The world of box sizes is one of exciting and hardly limited possibilities.