Airport security has one rule that trips people up. It is all about liquids in your bag. So what is the 3-1-1 rule for travel?
Here is the short answer. It limits the liquids you can bring in a carry-on.
Each container holds 3.4 ounces or less. They all fit in one quart-size bag, one bag per person.
This guide breaks down the rule and how to pack for it. Know it before you fly.
What is the 3-1-1 rule for travel?
The rule sets limits on carry-on liquids. It keeps security lines moving fast.
The TSA sets this rule for flights in the United States.
The three stands for 3.4 ounces, the max size for each container. That is about 100 millilitres.
The first one means one quart-size bag. The last one means one bag per traveler.
Did you know?
The 3-1-1 rule counts the container size, not how full it is. A half-empty 6-ounce bottle is still not allowed, even with little liquid inside.
What the 3-1-1 rule means
Here is each part of the rule made simple. Follow all three and you sail through.
See how it fits together? Small bottles, one bag, one per person. That is the whole rule.
Medicine and baby items are exempt in reasonable amounts. Just tell the officer about them at the checkpoint.
How to pack for the rule
Use travel-size bottles for all your liquids. Buy them, or refill small ones you own.
Bigger bottles must go in checked bags. This keeps airport security fast and simple.
Keep the liquid bag near the top of your carry-on so it is easy to grab.
Know the rule and security is a breeze. Pack your liquids early using a good packing timeline.
Liquids are also easy to forget, so check our most forgotten items list. Then round out your bag with the 10 travel essentials.
Frequently asked questions
What is the 3-1-1 rule for travel?
Carry-on liquids must be 3.4 ounces or less, in one quart-size bag, one bag per traveler.
What does the first 3 mean?
Each container can hold 3.4 ounces, or about 100 millilitres, of liquid at most.
Does the rule count how full the bottle is?
No. It counts the container size. A large bottle is not allowed even if nearly empty.
Where do bigger liquids go?
In your checked bag. Only small, quart-bag liquids are allowed in your carry-on.
Do solid items count as liquids?
No. Bar soap, solid deodorant, and shampoo bars are not liquids, so they skip the rule.
Is the rule the same everywhere?
Most countries use a similar 100-millilitre limit, but always check the rules for your airport.
So what is the 3-1-1 rule for travel? Liquids of 3.4 ounces or less, in one quart bag, one per person.
Use travel-size bottles and pack the bag on top. Then you breeze through security every time.