You obviously haven't flown for a while...
Security will absolutely not let you take anything over 100ml on the plane with you. All 'liquids' under that have to be x-rayed - including moisturizer/shaving cream/gel and other 'liquids'.
Basically, they are worried you will LITERALLY have a bottle bomb!
h34r:
Any liquids will need to be packed in your checked in luggage and hope the baggage handlers don't smash or steal it.
On my '07 trip to the USA I remembered to put all fluids (< 100ml) in a zip-lock bag for the international legs. At Sydney they went through most of my carry-on, had to remove my shoes, laptop, and the zip-lock bag was scanned separately. At LAX on the way back however, I (honestly) forgot to mention the zip-lock, or that I had any fluids. Shoes off, laptop out, carry-on scanned, off ya go.
Carry-on at this stage contained all my power cords, thermal-pad with fans for the laptop, and a reasonable bunch of electronic gadgets (I'm a nerd). I saw the x-ray screen - contents looks pretty dodgy.
Maybe it's just that I was
leaving their country rather than entering, but they seemed more concerned about doing their half-hourly 'everyone freeze!' routine, where security go running through the crowd pretending to look for someone so that everyone thinks the security are the ones in control. I had a cleaner standing next to me when it happened the first time and she started laughing at everyone to herself - "they do this all day, for practice" she said. I heard it a couple more times from the gate.
For a while they didn't let you take batteries on a flight (for fear of using as a detonator) but they have power outlets in the seats. You can't take nail clippers, but they give you a knife. The make you take off your shoes for screening because one person had explosives in their shoe (they should have put something in a bra... that'd make flights more interesting). Then, despite all the concern they have, they are lazy about screening anyone who isn't wearing a turban. There's really no point doing this half-arsed. Either scan everyone properly, or don't scan anyone.
What was my point? Oh yeah - the 100ml limit is just for international flights. I came back from Cairns with a bottle of wine in my hand luggage. Wasn't even questioned at screening. Change in pressure isn't significant enough to worry about (they have cans of soft drink/beer on the flights, and the popping in your ears is just because ears are
very sensitive to changes in pressure).