Great question — answering as the UphillTech team:
First of all, DO NOT bring anything smelly into your tent. This includes food, tooth paste, deodorant, or anything else that has a smell. Also, keep fires away from the tent. I recommend setting up a bear triangle campground. Cook your food in one corner, close to that corner–maybe 50 feet away–set up a latrine area. About 200 feet or more away from both, set up your tents. Keep your food in the kitchen area, tied up high. When hiking, the most important thing to do is to make noise to let the bears know where you are. They don't want to mess with humans in general, but they will if you startle them. Keep your smelly stuff in some kind of an easy-to-dispose-of container. If a bear attacks...
Full answer by PearsonArtPhoto: https://outdoors.stackexchange.com/a/229 (CC BY-SA 3.0).
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