That and a lot of people thinking about BOBs don't even put enough stuff in their automobile to survive overnight, if it breaks down before Lord of the Flies hits. I have a survival bag I carry, because I fly helicopters in the mountains and you never know when a chip light will mean an impromptu overnight camping expedition. It has all the basics; fire, shelter, water filter (plenty of water in this area), paracord, multitool, head to tow rain clothing, a trauma kit, and signaling. It is a weird shaped long rectangular bag, but it fits well in vehicles. In the summer I always have at least a gallon of water in my vehicles in the winter I always have sleeping bags, warm clothes and snow boot. I have chains in my car (that I have never had to use) year round.
It would also be smarter to prepare for the natural disaster that you might get evacuated for. What are the critical items you would take with you. Wedding photos, hard drives, critical documents. You might not have much time to make that decision. Even a list of those items made now, would help in a time of crisis when you aren't thinking straight.
Cloud computing really takes the strain off important documents, pictures, and info if you keep up with it.
I almost lost all our pictures and videos of China from when we got our daughter thanks to a cheap ass netbook.
Luckily, my wife had a single armored thumb drive with a backup on it.
Never Again!