What is the 3-1-1 rule for carry on liquids?
3 stands for:Â Â 3.4 ounce containers or less placed in…
1 stands for:  One quart sized clear zip seal bag.
1 stands for:Â One bag per person allowed in screening bin.
This limits the amount of liquid a passenger can carry during flight. Be prepared, TSA searches slows down the line, be sure that the 3-1-1 rule is followed to speed up search time. If in doubt, put your liquids in checked luggage.
Items like medication or baby formula are allowed in reasonable amounts above 3 ounces, and are not required to be in a zip seal bag. Be sure to declare those items at the inspection checkpoint.