Why do you need to carry anything onto to the plane anyway.
I take with me on nearly every flight
- a neck pillow
- nose spray
- ear plugs
- paper tissues
- chewing gum (if I rmemeber; I often don't, but it helps my ears)
- something to read
- my laptop (just because my regular luggage doesn't always make it to the same airport as i do, and I need my laptop.)
on longer flights, I'll add an mp3 player, more stuff to read and some chocolate.
Plus the things I carry on me: keys, wallet, money, ...
Why do I have that stuff with me? Because over the stretch of several hours chances are pretty good I'll need/want most of it.
Of course, the point is moot as long as terrorists keep planting their explosives on their body rather than their carry-on luggage. Also, it's a good thing the majority of terrorists these days seem to be rather incompetent. I am certain that if they were just of average intelligence and sufficiently determined there would be nothing to stop them.