I have a LeSportsSac backpack that's discontinued.

My backpack challenge: I do not want a backpack that has obviously exposed zippers. The old SportsSac I had included a flap that folded over a drawstring so as to force pickpockets to unsnap the flap, then open the drawstring (assuming they weren't just slashing bags). It's so tough to find a backpack that requires that extra step. Any other suggestions?