Do I need a backpack or a crossbody for anti-theft travel?

Reviewers across travel subreddits broadly agree that a front-worn crossbody or sling is the single best pickpocket deterrent because the bag stays in your sight line. Anti-theft backpacks make more sense as a primary carry-on or day pack where you need laptop space and load-bearing comfort. Many travelers we read combine both, an anti-theft backpack for transit days and a small crossbody for sightseeing.