The big change, which will affect some of us who do mail packages or big envelopes, is that first class 1 oz is 44¢ but each ounce after that will be 20¢ instead of the former 17¢. Flat rate boxes will stay the same. Not sure about the media mail, I think that rate is also increasing. I will google and see if there is some more going on that affects those of us who do mail items.