Daily, in town, I really don't have much beyond immediate emergency/first aid. I only work 6 miles from home, and my job is in an 'unarmed victim zone.' Whenever I go farther, there is a bag that goes in the trunk which carries necessities for a few days. When I travel I custom pack based upon route, destination, and time of year/weather.
For instance, an AK or AR may be in the trunk for most trips, but those do not go with me to California (if the reason isn't obvious--please ask, I don't want you getting into trouble). Also, when travelling over high passes of the Sierra Nevada range in CA I pack differently than when headed to Phoenix, AZ--obviously much different terrain/climate.