Best known practice is pepper spray. There are legal problems crossing national borders and boarding airplanes with pepper spray.
If you buy pepper spray for the first time, buy two cans and practice with one. It's readily available in trail towns along the northern Rockies, in the US and Canada. Every single hiker I saw on a recent trip in Alberta had pepper spray.
I hiked the Appalachian Trail through NJ and I saw a few black bears there. Frankly, they worry me more than grizz. They're more accustomed to people and there are a lot more of them (both bears and people). There have been more fatal bear attacks in the Eastern seaboard states than in the US Rockies.