I find people are looking for a single fail-safe guarantee on bearproofing.  That just doesn't exist.  Our best bet is to follow the same guidelines that have been around for years.  Keep a clean camp.  Control smells.  Make food difficult for critters to get to.

Some decide that a single failure invalidates the guidelines.  There are no guarantees.

Barrels can help, but there is no guarantee.  I've seen pictures of them ripped open.  I do hear that olive barrels & the titanium bear vault are the best protection.