I have always carried one of the small Priority Mail mailing boxes, it comes folded flat and they are available for free from the Post Office (sort of like a very small FedEx box), along with a Priority Mail stamp. If I ever had problems, in goes the offending item along with some TP from the men's room, address it, and off it goes. Only had to use it once, but it worked fine. Took me maybe 5-8 minutes total.