Originally Posted by
estnet
All this is true in the US, but NOT at airports overseas (eg SIN, NRT) where contact lenses solution is not exempted from the 100 ml limit

I ran out of contact lens solution while in Sydney and could only find a 4oz bottle. With no bags to check, I had nothing to lose, so I put it in a separate baggie on the way back to SFO and it made it through 2 searches at SYD (1 security, 1 random pre-boarding) just fine.
Maybe I just got lucky -- I was not sure of all the countries' rules -- but that little 4oz bottle also made it to LAX, NRT, BKK, and back to SFO, before finally...running out!