One word of caution; I would never suggest putting anything other than your name on the outside of your luggage. If you put your address or phone number on the outside, thieves can easily find out where you live.
So I always suggest only putting your name on the outside and nothing else. If you want to put addresses, itineraries, or anything else, only put it on the inside of the luggage.
Our son works for United and confirms all the airlines need is the luggage tag they provide. But if you want to put another tag on there, then your name is all that's important should the bag become lost.
If you feel uncomfortable only putting a name, then put your cell phone number and not a home phone number.