I don't think there is such a thing. If there is food in it they want, there'll likely be some bears that figure out how to reach it and break into it.
My folks had a black bear take an exterior door off the hinges to get into a porch that had a cooler of some meat in it.
People I know who used to guide in the Boundry Waters Canoe Wilderness Area used to string food Duluth pack between trees 20' into the air. That worked pretty good, until the bears figure out to climb 30' up one of the trees and jump out landing on the pack and tearing it down. They're very smart and inventive from what I've seen and heard.