My thought process is to be prepared in stages: A- All the time, B- Daily, C- Should there be some sort of disaster - natural or otherwise.
A- Whenever legal I always carry a folding knife. My coats and jackets all have a short piece (5' ) of paracord, a book of matches and a tube of chapstick (fire starter in a pinch, lip balm and can be used to slow bleeding). These three items will pass through TSA security. My billfold has a couple adhesive bandages, a butterfly bandage, a needle and a safety pin. My keychain has this small multi tool attached. Also TSA acceptable.
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B- Whenever possible my EDC pack is the vehicle that I am currently in. At work it stays locked up in the parking lot due to firearms restrictions. It contains everything that I would need to get home in case of an emergency or have to make it without support for a few days. I built the same pack for both of my sons less the pistol. Remember to include at least a couple days of medication if applicable.
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C- My pickup is equipped to work as a SAR point or a potential bug out vehicle. It is always loaded with equipment and supplies to support my family and dog. The seat back pouches contain a standard first aid kit and a separate trauma kit with blood clotter and a stapler, which have both come in handy for both fellow hunters and strangers when we were a long way from a hospital, Surefire flashlight, water, fire extinguisher, gloves, pet supplies(food, treats, collapsible water bowl and a leash), misc. tools, energy bars and a little "anitfreeze" along with the other items pictured. The saddle blanket on the back seat does duty as a seat cover, ground cover when shooting prone and a blanket.
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My choices in items are based on a lot of years of making sure I had the things that I actually used and over packing and carrying totally worthless items until I realized that I would never use them.
My suggestion- make a list of absolute "can't live withouts" and have them ready for use at any given moment.