What information do you have to put on a package that you send to someone?

Do you have to put any information at all? I am going to send a package to my friend that lives in kansas and I live in chicago. Thank you very muchWhat information do you have to put on a package that you send to someone?Make sure that you but Sender on the back with your name and address, so that if it doesn't reach your friend for whatever reason it will be returned to you.What information do you have to put on a package that you send to someone?Name and address?