A canister of pepper spray could do quite a distance in incapacitating an opponent. Do you already have a weapon of personal protection? Perhaps you do, but my buddy used to have pepper spray plus a gun. My other buddy used to have a stun gun as well as pepper spray. Irrespective of what you individually like to carry, these pepper spray canisters are inexpensive, small and can even be on the keychain. You may as well have an extra option like that when it comes to you possibly having to defend oneself towards an attacker.