Looks like a small fire extinguisher, filled with a very strong pepper spray, intended for use in bear country where a hiker is opposed to carrying a firearm, or where firearms are prohibited.
Photo of bear spray used on a bear....
After putting hands together, saying “namaste”, chanting OMMMMM and talking gently to the bear have failed.
Then run for your life if you are unarmed.
With your last breath you may hear “Only you can prevent wildfires.” Or maybe not.