A word about firearms and bear repellent sprays:
Firearms should never be used as an alternative to common sense and sound bear avoidance principle. They are to be used for protection only as a last resort when an attack is imminent. Bears will sometime approach to within 10 feet before turning and running away. It is legal to shoot a bear in defense of life or property in Alaska ONLY if you have made efforts to avoid problems in the first place. Note: In the event a bear is killed for self-protection, you are responsible for ending your planned itinerary and transporting the skull and properly skinned hide with claws attached to the proper authorities. Further information on these regulations are available from the Alaska Dept. of Fish & Game.
Defensive aerosol sprays which contain capsicum (red pepper extract) have been used as an alternative for protection against bear attacks. This spray, has proven effective in several situations. It is easy to carry and has a range of up to 6-8 yards. You must handle it carefully - if sprayed upwind, it may blow back into your face and disable you. Similarly, do not transport it in a vehicle or light plane unless it is in an air-tight container because accidental discharge could disable the driver or pilot. Check it frequently during your trip to be sure it hasn't accidentally discharged. If left to linger it may act as an attractant rather than repellent.