Many will use canisters, but they're not always needed. It all depends on the area and range you're in. Some areas it is much more common to have black bears poke around above tree line, where in other areas, the geography is such that there are far more abundant food sources for them well below tree line at lower elevations and it is ultra rare to have them come up to the higher country. Many here, including myself, will not bother with a weight of a canister if the area such as some national parks, does not require it. For me, I just rely on odor proof bags but still stash my food and other scented items a reasonable distance from where I sleep, just in case....and I've never had a problem. But again, most of the time I haven't been able to hang my food, I've been in one of those areas where the bears tend to stay lower below tree line. If oder proof bags aren't enough for your peace of mind, you could get a bulletproof Ursack bear bag. They also offer an add-on aircraft grade aluminum liner for them to help protect the contents you put in it from being too disfigured by a bear intent on giving it a beating before giving up on it, should a bear find it.