I guess what you add to your bag , depends on a lot of factors , one of which would be how long do you plan to be 'away' for ?
Since the basic concept is 72 hours something like a lantern would be unnecessary IMO.
My bag has a cheapie AA LED (Chi-Com 8 LED twisty) , not a bad little light for the whopping 3$ I got it for , runs on one AA. I keep 3 extra fresh AA Duracells in my bag too.
It's been dropped in the toilet ( dont ask how

) and it still works so I know it will handle some water lol. Also carry two fat stubby '8 hour' candles and a citronella.
Now I know if I had to scram with my BOB , on the way I out I would grab at least my two Surefires if not a few more of my LED's I keep on my top shelf , light I dont have to worry about too much.
Added notes..
If you plan on using Bics for flame , try and buy the bright orange ones , can be found much easier if dropped.
One Gent on here stated that your better off buying a real deal Bic than the
3 for 99 cent pack ones , those lighters are okay for smoking but otherwise they suck , like he said.
I've only seen caffiene tablets mentioned in a few articles , I have to say I think the addition of some is invaluable , yea it makes you thristy but I dont plan on being in the desert (in the valley here the weather is usually pretty livable and water is not too hard to come by.)
Saws -
Do you guys prefer the goods wire type saws , or the folding type such as Fiskars ?
Shanks Mare !! This is something we should all bear in mind , footwear.
Dont have to spend a paycheck for good footwear but it is essential since many of us might find ourselves using our feet for travel.
Imagine doing so in a pair of sandles or office type shoes.
I keep an old yet great shape pair of Carolina's on top of my bag , added footpad , very comfortable and durable , somewhat waterproof.
How about adding one set of extra socks in your bag ? or is that more of a comfort thing ?
hmmmm........