Another constraint to a Get Home Bag is your storage situation at work or school or wherever you'll typically be when you're out.

Even if you drive, depending on what kinds of events you are trying to prepare for, keeping your kit in your car may not be the smartest idea. For example, in earthquake country, keeping your kit in a car parked in a seismically iffy parking structure could turn out to be a dumb idea. Remember in the North Ridge or Loma Prieta quakes here in California, a number of buildings with carports on the ground level collapsed during the shaking.