rather than carry a backpack, I pull a trolley & it's amazing how a colourfull trolley is invisible, tho it has only been once that a phone watcher has tripped over it & he managed not to fall, disappointing his friends & me. Or maybe they were just grinning at his crazy dance moves to avoid falling.

I've learnt to drag my trolley behind my side so it is more visible, tho some folks swerve when they are very close.