The bear or raccoon or whatever that becomes addicted to peanut butter or Snickers bars will progress to ripping apart your pack while you're carrying it! That's what has happened with the raccoons on Washington's Olympic National Park coast. Things have calmed down a bit there since the NPS started requiring hard-sided containers.
_________________________
May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey