It sounds like it could be handy for international shipments? Normally it costs an arm and a leg to ship a heavy package overseas, but if a traveler has an ext

It sounds like it could be handy for international shipments? Normally it costs an arm and a leg to ship a heavy package overseas, but if a traveler has an extra check-in slot available, they could carry an extra 50 lb package for like $25. It normally costs like $300 to ship something that big overseas. The liability and insurance issues would be pretty annoying to deal with, though.