In 2011, I was involved in a pretty big natural disaster (Earthquake, tsunami, no water and power for 9 days). I was stranded at work (I travelled there by train everyday) and had to walk 4 hours home in the pitch black night through an urban area.
The most useful things I had in my bag were:
-Flashlight and spare battery (No streetlights or any kind of ambient light in an urban area is pretty dangerous. I saw people walk into one another, sign posts and a few fell over).
-Cellphone and spare battery (I had no signal for around 4 hours, but after that I was able to contact my wife and let people know that I was OK).
-Mini pry bar (The only way into my apartment was to use it to jimmy a window open. The front door was totally stuck fast).
-Space blanket (I didn't actually use it, but if I hadn't been able to get home, I would have needed it).
-Cash and spare change (Local convenience stores were selling food and water. They had no power, so big notes were hard for them to change).
-Band Aids (Blisters on my feet).
I had a pen knife, but I didn't need it.
What I wish I had had:
-Comfortable shoes (Walking 4 hours in skateboard sneakers left me with blisters).<END QUOTE>>
-------------------------------------------------------------------------------------------------------------------
This is about exactly what most New Yorkers who had to hike home from Manhattan on 9/11 will agree on. Good shoes, cash, a cellphone spare battery (charger?), a flashlight for those out after nightfall. A buddy walking home to New Jersey did not get home until 4 AM, wearing leather soled laceup wingtip shoes and a useless dead phone he could not recharge. A working Blackberry would have made a huge difference. He actually had everything he needed waiting for him at his office (running shoes, phone chargers, stash of power bars, etc) but he never made it to his office that day. He was not in those days, a SAK-on-keyring kinda guy. He is now.
OTOH, a 15 pound backpack full of wilderness camping gear would have been worse than useless to him. Starting a campfire and lashing together a lean-to were the last things he needed.
Keeping yourself in some semblance of decent shape is worth remembering, too. My buddy in Jersey was overweight by a good 40 lbs and that was a huge problem for him on his 20+ mile hike home. Per Zombieland, being young but o/wt and unaccustomed to exertion is far more hazardous to survival than being older but reasonably fit.
My .02.