I saw the canisters at the Visitors Center. They are great big black things, and I think they are Garcia 812s (not sure). Most of the bears are at Whitney Portal, and they come through there on a VERY regular basis. I didn't see any bears when I stayed at the Portal, or when I hiked Whitney. Based on postings I have seen on this site, they rarely go over 10,000 feet, but sometimes they do. Don't let the bears worry you. They are all black bears, and will avoid you if they can. If they are freaking you out, follow safe practices and just carry a loud whistle or an air horn, as they hate the noise.