In flight, aircraft are pressurized at approximately 8500 feet. This can cause printer cartridges to leak. Save yourself the mess and damage by wrapping the cartridges in plastic. Your luggage . Gate agents make mistakes, so be vigilant in double-checking that your bags have the correct tag affixed to them.
Outside tags have a tendency to be shorn from bags in airport luggage-handling systems.
Best to label your bag inside and out. Some business travelers prefer to list their business address only. Listing a home address could lead to burglary if the scoundrel that took your bag also wants to hit your house. Your phone card . Some phones now have special shields to thwart prying eyes, but if not, cover the phone with your body when entering your number.