Clay, don't waste your money or extra weight. Yes it might make you feel better, but WHERE are you going to carry it. IT HAS TO BE READILY ACCESSIBLE and unless your are a western gunslinger, if you need it, you will have to be that fast.
If a black bear is going to attack there has to be a very unique reason. I have never been able to get close to a black bear- they have all ran away when ever I have tried. Last summer I was fishing in a stream and after looking into my fly box I raised my head just as the most beautiful cinnamon black bear I have ever seen came up the bank about 30 feet away. My first thought was to slowly reach into my pocket and get my camera- then the other voice in my head (the one I don’t listen to very often) said- what would my wife say if I took that picture this close to the bear (I wouldn’t be allowed to fish alone, again). Well, I raised my hands above my head and told the beautiful thing to get out of there (very loud) and he turned away and left. Afterward I was really ticked because I had missed the chance for a great picture (but I can still fish alone).
I have had other encounters with grizzlies in the Alaskan bush, each one is a great story to tell the grandkids (when I get some), even then, I never carry anything. I am too busy doing what I’m doing to worry about that one in a million (or more) thing that might happen.
There are millions of people hiking in the woods and they don’t have a problem with bears. If you look at the list below, Bears aren’t even on it. I guess you should carry Hornet spray instead. You have a far greater chance to have a problem with a Bee or Wasp or Hornet then a bear accordingly to statistics. I wouldn’t suggest you take a dog either- you have a greater chance of being killed by the dog then any bear.
This was kind of fun to write, maybe next time I’ll tell the Grizzly stories.