Ahhh, hell... since everyone else is having fun, I'll try to give a reasonably serious answer:
I don't actually have a bug-out-bag per say, but I'm the kind of guy who tries to be prepared for the things I might need to deal with in my travels. Since I'm an outdoor enthusiast and a shooter, I already have quite a bit of camping gear, freeze-dried food, and guns/ammo stuff on hand. If things hit the fan, I'd probably grab what I thought I might need of this stuff.
But, more to the point of a preparedness kit, I'll talk of the stuff I have in my truck. Since I often travel to places that are pretty remote, and do so in a state where weather can be a real concern in the high mountains, I try to keep my truck stocked for the emergencies I think I might someday encounter. I have a topper on the bed of my truck, and a sleeping platform built in the back that I use for camping. The area under this platform is used for storage, and I try to keep enough emergency gear back there to get me through expected problems. Here's a partial list:
1) A selection of hand tools that are appropriate for working on my truck (picked mostly for the needs of servicing this vehicle)
2) A spare fuel filter and water separator for the truck (it's a diesel). A quart of oil for the truck.
3) A tow strap and tow shackle for vehicle recovery
4) 2 MRE's, 2 MRE heaters, 3-5 freeze dried meals, an alcohol stove, a cookpot, and a liter of fuel for the stove. Also, some simple store-bought food: a package of jerky, a couple of cans of tuna, some M&M's, etc. The food I have should be enough to comfortably sustain me for about a week, should I break down or get stranded in a blizzard in the middle of nowhere.
5) A sleeping bag and sleeping pad.
6) A water purifier and spare water bottle.
7) A change of clothes to include: BDU pants and long underwear, spare socks and underwear, a fleece jacket, a waterproof/breathable shell, a windstopper hat, and a set of gloves. If you get soaked in the backcountry even on an everyday trip, this stuff can be nice to have. But, it can be a lifesaver if you're caught otherwise unprepared in a bad situation.
8) A candle lantern, matches, and a lighter
9 A first aid kit, whistle, and spare flashlight
10) A camp towel
11) a 500 pack of .22lr ammo (I don't usually keep the rifle in the vehicle, but often throw it in when heading to the mountains... so the ammo is there if I want/need it)
12) During the months when weather doesn't stay below freezing I usually keep a 7-gallon container of water in the back of the truck.
13) A set of work gloves for vehicle repair type stuff.
14) Some paper towels and toilet paper.
15) A surplus style shovel.
The tools are stored in a tool box, and the emergency/survival equipment is stored in a rubbermaid style tote. I'm sure there's other stuff I thought to throw in there that I just can't think of at the moment, but you get the gist of what I'm saying. The truck works well for this purpose because I can easily keep the stuff I want to have in the vehicle without interfering with my ability to transport the other stuff I need, or tow the trailers I tow. It's just a couple of boxes that are back there in case I ever need them.
To me, the non-gun stuff is a far more important part of my survival equipment than the gun stuff is, for the most part. I'm much more likely to find myself broken down or weather-stranded 50 miles from help than I am to find myself fighting off hoards of the undead. I guess if we were talking about an "end of the world, zombies eating our brains" scenario, I'd certainly be grabbing more of the gun stuff. But, there's no real need to throw this in a bug out bag, at least from my perspective. I can grab my food, guns, and ammo within a couple of minutes if I ever saw the need to, and the truck is already set up for vehicle camping as is. I do carry my CCW gun with me pretty much all the time, so that's already with me regardless of what vehicle I'm using.