Yes in some parts of Nashville you are able to carry alcohol and drink it while walking down the sidewalk after leaving a bar or other establishment or wherever you buy the alcohol from.
A bill was passed in Nashville that allows you to walk around with and carry alcohol on Fifth Avenue between Demonbreun Street and Korean Veterans Boulevard.
Other places it might be illegal but those places are fine.
As long as you're not drunk you can legally carry sealed alcohol including cases of beer or bottles of beer in your hand while you walk from a store to your home.
As long your not drunk you're fine to carry the sealed alcohol with you.