Ten items you should have in your camera bag

Eleven. You forgot the toilet paper.....

1 camera
2 lenses
3 tripod
4 spare battery
5 2nd sd-card!!! (sometimes i forget my 1st sd-card at home)
6 insect repellant
7 cigarettes
8 condoms
9 Aspirin, tooth-brush ...
10 and don't forget the camera bag at home!

A good 10-stop ND filter and mini tripod.

Good list. I always have water and ibuprofen because my back always ends up hurting lugging the backpack around.

What bag is that pictured?

a folding macbeth colour reference or a grey card, a giant ziplock baggie or two, money, pens , notebook , two band aids , some antacids , an aspirin or two, sometimes a pair of sox and thin gloves. I write my name in ipermanent maarker on the inside of the bag with an email address and a reward offered for its return. Smartphone is in the jacket, not the bag.

You dont really need a spare batter with an DSLR.. ive gone over 2000 shots on one batter on my D700.. depends how much you chimp.

For memory cards.. its good to off load your photos and clear out your card on a routine basis, rather than waiting for it to be 100% full.. i.e. you dont want to be walking around with 60GB of photos in your camera. So unless you are using low capacity cards for no reason, then you dont need a spare either.

Your bag should have what YOU will need in it. If you don't know what that is, why do you even have a bag?

If I were forced to carry a bag (I don't carry one now), I would have no use for the tiny tripod, the rocket blower, the poncho, the remote release, the little cloth, the polarizer, or the little flash.

In my perception, that tripod is a fashion accessory, possibly suitable for a pocket P&S in a dire emergency, but not for a DSLR.

Hot shoe spirit level.

Roll of plastic to lie down on.

Sensor cleaning pen.

Insect repellant.

Compass.

Yes, I'm a landscape photographer.

I would add earplugs, spare reading glasses, and pen and paper.

How about a small P&S to help prevent you from completely missing a shot while you try to switch lenses, change batteries, or attach a flash unit in a pinch? Also, when I'm shooting sporting events, I'll often use the DSLR for the action shots, and a P&S for spectators and shots before and after the event. Up close, people tend to act much more natural and are less intimidated by a P&S. Image quality may suffer a little, but you are often more likely to get the shot that you want.

I'd add hand wipes (individually packaged wet ones are nice) to the list - you don't want to touch your camera with BBQ sauce smothered hands.

It was all going well until I read the word 'smartphone'. A useful tool, they say, in that it helps with composition and calculating depth of field... WHAT?
C'mon: a mobile phone is always in everyone's pocket and it's useful in case of an emergency; but saying a smartphone is useful for helping with compositional basics and calculating depth of field is pushing things too far. If you can't compose and determine depth of field by looking into the viewfinder, chances are you suck as a photographer. In such case the iPhone won't help your case.

By way of comparison, what do I have in my camera bag apart from the Hasselblad, lens (sometimes two), cleaning cloth, film? Nothing!

No batteries, no meter, no cards, no tablet, no smartphone, no tripod, no remote, er no camera bag (at times).

For me it is so liberating. I love it. I am thankful I don't have to carry around all that supporting equipment (that's just begging to get lost or stolen).

Meh. I would have gone with a gorilla pod instead of just a mini-tripod. Kill 2 birds with 1 stone.

I'd add a small white balance reference card.

You missed "A Camera"! :) Just kidding, it's a good list.

You forgot the two MOST important things: duct tape & a Swiss Army knife!