lol idk where you live but when people take bags that dont belong to them someone else in the bus tells them to put it back
that usually doesnt happen since people have the decency to not take someone elses crap
People probably wouldn't steal them, but I've just always been a bit paranoid about it.
Plus my bus journeys are for a reasonably large distance with multiple stops.
Lots of people will get on and off over the course of the journey, but not many people will be on at any one time.
So, I always imagined it'd be kinda easy to steal someones bag on there without being noticed, and slip away at the next stop.
But then again, what would a thief really want with a school student's backpack.