Store Your Luggage!
You can use the lockers or you can head downstairs and store your luggage with an attendant that charges by the hour and locks up your bag. Make sure you plan your time, this spot gets busy and you don’t want to be waiting to get your luggage and have to run and meet a train. Sorry I forgot to get a picture here, but follow the signs, you have to leave the train station and enter another area that is attached, but not in the station. Do NOT lose that ticket!
Check out the link below!
Luggage Storage Termini Train Station: Left Luggage Rome Station | Stow Your Bags
Nyri~The Unnerved Traveler