"We moved our base camp last night and were now positioned literally
within feet of the river. Have been sitting here watching the border
patrol patrolling in their riverboats all night and all morning..."~Jim Robinson
Make sure you read the State restrictions on the site. Surprisingly, they are not illegal or restricted in California. Of course there's also pepper spray, but depending on the heat of the moment and wind, it can come around to you. Also, think hornet spray that shoots far, but in big bulky cans. The Knuckle Blaster easily fits in the pocket or purse.
Yes, I know the best defense is a handgun, but you probably don't want to use that in a simple scuffle.