Most travelers know you're limited in what liquids you can bring on a flight, but may not know the exact numbers off-hand. The TSA's 3-1-1 rule can help.

You'll find comparable rules as you travel internationally — though the U.K. is moving toward removing these restrictions.

But perhaps no rule is more misunderstood than the TSA's Liquids, Aerosols, and Gels Rule, specifically, the 3-1-1 policy for carry-on bags. From what you need to know about TSA's liquid ...

But the TSA said that until it has the ability to implement detection tech in every airport, the 3-1-1 rule will remain in place. TSA refers to the liquid rule as the liquids, aerosols ...