Don't become a Robber Target. The less you carry the better.
Under construction
In a travel guide I read: "Don't make yourself a target on the streets. Carry as little as possible ."
If you carry a backpack it is quite obvious that to robbers that you are on the move carrying all your things. Which may include:
At least a few hundred dollar in cash - more if it is a "cash only" country.
passport
credit cards
camera etc
Nude beach infested by pick pockets