If you have any kind of commute, it is vital you have a bob in your car, especially in the northern climates.
I live in a semi desert climate, but still in the city, my vehicle pack includes a .22 pistol, food, water, sleeping bag, the usual, but I also keep a Gustbuster SunBLOK umbrella.
Mine is based on walking uphill for 25 miles to get home, and taking 2 days to do it, and it being over a 100 degrees during the walk, the SunBLOK umbrella is designed for blocking sun, and of course rain also, it has a silvery shield as the canopy, and a black underside, to stop reflection of light.
I also carry paracord and the durable, double sided space survival blankets with a reflective side, to put over the roof of the car for a possible day long freeway jam, those happen occasionally in So. California.