Butterfly knives are LEGAL. You can have your firearm loaded and in your glovebox or any regularly installed compartment of your vehicle. You can wear it on your hip, or have it on your passenger seat if you want. You won't be able to keep a butterfly knife in your pocket without a concealed weapons permit, but a pocket knife will be alright. I'm fairly certain that there aren't any state laws governing knives other than needing a permit to conceal if the blade is over a certain length. You can even have a switchblade if you wanted! If it's under 2 inches you can take it back to California with you. Might find travel with it a bit illegal in some states, but I digress. You won't have much to worry about here when it comes to carrying, really.