Originally Posted by DallasBill
And you will find no mention of 4oz for contact lens or saline anymore on the TSA web. It simply says if the size is greater than 3 ounces you must declare it, it's allowed in carry-on, and it should not be in the 1 qt bag.
So, any size should be allowed, since it's not prohibited.
An open 12 oz saline solution bottle is "safe"; however, a factory-sealed 500 ml (16 oz) bottle of water isn't?