What Is the 3:1:1 Rule in Sun Country? Airlines refers to the TSA liquid policy that passengers must follow when carrying liquids in their carry-on bags. Since Sun Country operates flights within and from the United States, it follows the standard TSA security guidelines.

The 3:1:1 rule means:

* **3** = Liquids must be in containers of **3.4 ounces (100 ml) or less**
* **1** = All liquid containers must fit inside **1 clear quart-sized plastic bag**
* **1** = Each passenger is allowed only **1 quart-sized bag**

This rule applies to items like shampoo, lotion, toothpaste, perfume, liquid makeup, and gels. If any liquid container exceeds the limit, TSA may ask you to remove or discard it during airport screening.

Passengers can still pack larger liquid items in checked baggage if needed. Certain exceptions are also allowed for medications, baby formula, and medical liquids, though they may require additional inspection.

To avoid delays at the airport, make sure your liquids are packed properly before arriving at security. Using travel-size containers and keeping them in an easy-to-access clear bag can help speed up the screening process.

Overall, the 3:1:1 rule is designed to improve airport security while making carry-on screening smoother for travelers flying with Sun Country.