I think this page has the bear sprays phat refered to.

http://www.mec.ca/Products/product_listing.jsp?FOLDER%3C%3Efolder_id=2534374302696025

One is 8oz with container, the other is about 12oz.

In Grizzly country, or even Quebec/Ontario, I would think about it. Here in New Brunswick when hiking and camping with my small daughter I use a tent and I carry a big stick and keep the food smells down and hang the food away from the tent. When alone I keep the food smells down, but only hang food at common camp sites, and don't use the stick or tent. The tent is not so much a deterrent, but so the bear can't see that there is a small child, which I think would be the only humans in New Brunswick at serious risk. Northern New Brunswick could be more like Gaspe, where there was a fatality once. Here we have lots and lots of bears, but hardly ever see them. I know they see and smell me, but out of respect more than anything else I try not to tease them with food smells.