Thanks for your comments. We do keep a really clean campsite and I've never seen a bear out camping. I did grow up on the edge of Quetico so I have certainly seen a lot of bears! The only time we've had a bear come to our campsite was at a "well used site" in Algonquin, and it ripped the bottom of our food pack while we slept (only got a bag of oatmeal). Clearly a late night with the food pack "not quite" high enough! We always carry pepper spray and I really enjoyed listening to the biologist's interview about his walk back to the truck with the bear! I was thinking pepper spray is for when a bear is really close (and prayer and brown pants would also be helpful). Air horn could be for a nuisance bear on a portage who's trying to go after your food pack (we do split our food up just in case). I totally understand the concern about hearing horns from miles away and I appreciate all of your feedback.