I'm new to Tom Bihn (I just bought a Synapse 25 and love it!). We're already looking to expand. My wife is debating between the Aeronaut 30 and the 45. We're going to Italy for 8 days in November which would be an intended use for the bag. She would also like to use the bag for the gym everyday and for carrying sheets and supplies (she's a massage therapist). We're trying to gauge whether the A45 is "too large" or whether the the A30 is "not large enough" for overseas. Any thoughts on this?