The Transport Security Administration (TSA) and other relevant authorities have established uniform guidelines for carrying liquids, gels, aerosols, creams, and pastes onboard. These rules differ for carry-on bags and checked luggage, making it crucial to know exactly what you're packing in each. Additionally, specific regulations exist for necessities such as medication and baby food, so it's important to separate these items from everyday toiletries like makeup and toothpaste. When shopping for souvenirs, it's wise to consider these regulations to ensure a smooth return journey.
Steps
Packing Non-Essential Items

- Non-essential liquids and gels, as well as aerosols, creams, and pastes, include: beverages, food items, cosmetics, personal care products, and insect repellents.

- Container size matters, not the remaining amount of liquid or gel. Therefore, even nearly-empty larger containers should go in checked baggage.
- Whenever possible, keep products in their original packaging. Unmarked containers may need additional screening, causing delays, confiscation, or even entry denial.
- If you need to use an item during the flight (such as toothpaste), buy a smaller version that meets the 3.4 ounces (100 ml/g) limit.

- Only one 1-quart bag per passenger is allowed. If your bag is too small for all your items, consider packing some in your checked luggage. If you're traveling with only a carry-on, reconsider what you're packing and leave behind items that can be bought at your destination.
- Each passenger is allowed one bag, but if you're traveling with others, you can share their bag if there's space.
- During screening, you'll be required to remove your 1-quart bag for inspection. Having a clear bag ensures the process runs smoothly.

- As long as the new containers are 3-1-1 compliant, you can transport liquids in unlabeled containers. However, expect closer inspection during security checks.
- Alternatively, you can remove the cap from the original container and wrap plastic around the opening to form an extra seal before reattaching the cap. For added protection, place each container in a separate sandwich bag to contain any leaks.
Essential Items in Your Carry-On

- The size of the container doesn't matter for essential items, so don't worry if they exceed 3.4 ounces (100 ml/g).
- Security may also need to inspect related accessories like syringes, IV bags, pumps, or milk warmers. Pack these so they can be removed easily as well.

- Visual inspection
- X-ray screening
- Small sample testing

- Refusing X-rays may result in additional security measures, such as a pat-down or closer inspection of your belongings.
Bringing Souvenirs Back Home

- When packing for the outbound trip, think ahead about the space you’ll need for return souvenirs. Consider packing only items you can discard during your stay to make room for your return items.

- If you're traveling internationally, be aware that customs fees may apply to your items upon delivery, depending on the nature of the items and the countries involved.

- The store's sealed, clear security bag remains unopened and unaltered.
- You retain your receipt for inspection.
- The item was purchased within the last 48 hours.
Warnings
- These tips are applicable for flights within the US, Canada, and certain other countries. If you're flying to a different country, contact your airline for detailed and specific guidelines before you travel.
- Threat levels can change frequently. This may lead airlines to suddenly alter their rules for transporting liquids and gels, so it’s important to verify updated regulations with them prior to your trip.