Usually a Lightweight-nylon made-stuff sack used to keep things, specifically food items and anything that can have a strong odor and can attract a bear. Any foods or even water bottles that have contained fruit drink mix in them at any time are placed within the bags including toothpaste and soap. The idea is if the bears cannot reach the items, they will not be tempted to venture too close to the camp and thus won't be a danger to humans or themselves.
Questions that are specifically about while camping in an area with Bears, how a Bear bag should be used, why it should be used, what all goes in it, where to keep it, etc are supposed to be tagged with this tag.
