There's been a lot of good discussion about this:
http://www.bikepacking.net/forum/index.php?topic=2013.0ML's map is useful:
https://maps.google.com/maps/ms?ie=UTF8&hl=en&oe=UTF8&t=h&msa=0&msid=200334849650645495946.00047e45e4239031f00c3&start=0&num=200&sll=46.7248,-112.807617&sspn=1.269004,2.221985&z=7From my own experience, here's some things to note about the RED sections - basically avoid sleeping in the red areas:
* Banff to Elkford probably won't be too problematic, as most can get to Elkford. You'll undoubtedly see some bears on route.
* The Flathead has some opportunities for inside sleeping, including the Butts Cabin. I wouldn't count on it, as it's first-come, first serve. Lots, and lots of bears in the area.
* Hopefully, it's easy to time it, so you're in the area after Eureka and the Swan Lake area in the daytime, rather than the night time.
* There's campsites a few miles after you turn L off of 83, they'll have beer boxes for food. The area after it, and before Richmond peak is pretty bear-heavy. Lots of folks took photos of that huge bear trap. The part right before it is also a part of the trail that turns into sorta-singletrack. It's spooky. Seeley lake is another good place to crash for the night - motels are available. The track afterward is super fast (and fun!) and you'll get to the next towns in no time. There's a work center in the middle of that, as well, if you need some, "company"
* There's no reason to sleep on top of Huck Pass - either do it, and get to Lincoln, or don't. It's a fun climb and funner descent. Haven't done it at night, though!
Montana also has a plethora of ready-made beer shelters called, "outhouses".
BigPoppa is right though, you're going to smell like food and stink like human, no matter what you do. Don't pour butter and bacon on yourself, or your sleep kit and go to sleep, though.
I don't think taking minor precautions are hanging up your food with a bit of parachord is a bad idea. Lots of people take bear spray. My second time around, I opted to go without it. It's another choice you should make for yourself.