The smallest size of the brand my SO uses is 4 oz., rather than 3 oz. as requested by TSA. Anyone had a problem with taking that size through on domestic flights? Thanks ...

from tsa.gov:
"To ensure the health and welfare of certain air travelers there are no limits on the amounts of the following liquids, gels and aerosols you may carry through a security checkpoint:

All prescription and over-the-counter medications (liquids, gels, and aerosols) including .. eye drops, and saline solution for medical purposes; "

Sorry - here's the rest:
"You are not limited in the amount or volume of these above items you may bring in your carry-on baggage. However, if these items are in containers larger than three ounces, please perform the following:

Separate these items from the liquids, gels, and aerosols in your quart-size and zip-top bag.
Declare you have the items to one of our Security Officers at the security checkpoint.
Present these items for additional inspection once reaching the X-ray. These items are subject to additional screening."

My optometrist happens to be located within a Lenscrafters. They have 2 ounce samples of several brands of solution which are handed out free to patients and sold for $1 to non patients.

He has also advised that it's okay to wash a travel sized eye dropper bottle with hot soapy water, allow to dry thoroughly, and fill with your favorite solution.

Thanks, guys! Your input is much appreciated ...

Limit for contact lens solution is indeed 4oz, not 3 or 3.3.

But they will still hassle you about it. We just came back from FLL and they gave my wife a hard time about her 3.5 oz lens cleaner.

Not certain they will hassle you - no problems for us 2 weeks ago with conact solution larger than 3 ounces.

It was carried separate from other items in their own 1 qt bag, put into the bin, no one blinked, and we went on (3 airports)