It is important for pepper spray in general, it easily accessible to wear, so pants or jacket pocket, to shake it shortly before use in the bag and use it immediately, without large so rumzufuchteln or threatening.
Those who have never used such a spray, should bring one to practice is time.
As I said, recommended, especially at the price, but by no means the strongest spray on the market. (-> FoxLabs, Vexor)