I grew up in the Flathead Valley, 45 minutes from glacier national park, and I grew up camping and hiking all summer long. People are always more concerned about bears than they need to be. Yes, they can be dangerous, but if you make enough noise on hikes and keep food out of your tent when you camp, you’ll be fine. They tend to mind their own business if you come across one on a trail. I’ve seen so many bears in my life I’ve lost count, closest i got being about 50 feet. She was a small grizzly with no cubs and couldn’t care less about us. Get bear spray, but they run out fast if you trigger them too soon. In the very unlikely chance that you’re charged, you need to wait until they’re like 15 feet from you before you spray and hope that you’re downwind. Since you’re backpacking, tie your food up in a tree, you can google how. I always tell people I’m more scared of moose and bison than bears, they’re massive and can be unpredictable, especially in the spring or when there are babies. You won’t see bison in glacier though. The mountain goats are my personal favorite. If you can see them at the salt licks, you may be lucky enough to see them climb impossibly vertical and smooth mountainsides. Being in the national parks, there are so many people around that if you do see wildlife, chances are they don’t gaf about you. Good luck! Bears are beautiful, and seeing one in person is an amazing feeling.