TSA’s “3-1-3″ rule about your toiletries/liquids/gels has not changed very much in the last five years, but for me the details of what you can and can’t bring and how you need to declare things are always a bit of a travel challenge as you struggle through the security lines removing belts and computers while managing your kids or parents.
First off, it’s recommended you pull together a “travel kit” with the stuff you’ll need in appropriate (100ml or less) bottles. If you travel as much as I do, it’s good to have this separate from your normal day to day stuff. You then just need to review the travel kit for anything you might need that might not have applied on your last trip (e.g. a medicine, suntan lotion, insect repellant, etc)
If you are checking bags put stuff there – it’ll save the hassles at security. Unfortunately many of us no longer check bags due to convenience and/or cost issues … and hey, why are you taking up MY space in the overhead bin!
Consider bringing pills rather than liquids when you can. e.g. pepto bismol, cough and cold medicines, etc. This makes things easier to manage.
Source: TSA Website
3-1-1 for carry-ons = 3.4 ounce (100ml) bottle or less (by volume) ; 1 quart-sized, clear, plastic, zip-top bag; 1 bag per passenger placed in screening bin. One-quart bag per person limits the total liquid volume each traveler can bring. 3.4 ounce (100ml) container size is a security measure.
3-1-1 is for short trips. If in doubt, put your liquids in checked luggage.
Declare larger liquids. Medications, baby formula and food, and breast milk are allowed in reasonable quantities exceeding three ounces and are not required to be in the zip-top bag. Declare these items for inspection at the checkpoint. Officers may need to open these items to conduct additional screening.