Of the several size canisters made by Counter Assault, the 8.2 oz size fits comfortably in the front pouch on the newer Wingworks Long Pockets. This offers easy access to a non-lethal alternative to putting off a variety of critters. Anything with eyes and a nose will be forced to deal with lots of irritation.
This is a powerful spray not meant for humans, and not to be left around for kids to experiment with. If it goes off in a vehicle it can be a serious issue for anyone nearby, not to mention upholstery.
In average hands, bear spray is said to be the most effective tool against bear attack. The idea is to create a wall of spray the bear walks into with maximum effect on eyes and nose. This is a small size, and in some areas another back-up or larger canister stored elsewhere may be necessary.