I agree with Herman30, carrying anything will make more of a target than not carrying anything and a messenger bag is going to be easier to steal than a backpack so it would make you more of a target.
_________________________
https://connect.garmin.com/modern/profile/eugenenine
https://pixelfed.social/i/web/profile/587437729469961861
https://www.alltrails.com/members/eugenenine/recordings