Guard Alaska 20% ultra hot bear pepper spray has proven so effective repelling bears, it is the only one registered with the EPA as a repellent for ALL SPECIES of bear! It is absolutely the most effective and powerful defensive bear spray available today. It is environmentally safe! Does not contain flammable or ozone depleting substances. The formula is scientifically proven superior, and endorsed by the Alaska Science & Technology Foundation. You need something you can depend on in the woods. Bear pepper spray is an effective deterrent to attacking bears. Treat all bear encounters with extreme caution. Carry on your belt so you'll always be ready or set it out at the camp so everyone has easy access to it. Some states now have hunting laws requiring possession of a defensive spray where bears are common. Check with your local authorities. Guard Alaska does not have an expiration date so you don't have to worry if it's still any good. The ingredients do not lose effectiveness with the passage of time.