Toiletry Packing Tips for TSA Liquids

Most travelers know the basic quart-bag rule. Far fewer know about the CT scanner exceptions rolling out at major airports, the 11 categories now exempt everywhere, or what actually happens when a bottle gets flagged at the checkpoint.

These tips cover the TSA liquid rule itself, not a toiletry shopping list. If you want the full guide to organizing your kit and switching to solid alternatives, that lives in a separate guide. This one is about the rules, the exceptions, and the edge cases that trip travelers up. A card with the right travel rewards program can also cut wait times through faster security lines, which matters more than most travelers realize. Before your next trip, double check your flight and connection times, since a tight connection changes how much of this matters.

The Core Rule Has Not Changed

• 1. The 3-1-1 rule is still the nationwide baseline. Containers of 3.4 ounces or 100 milliliters or less. All of them fit in one quart-size bag. One bag per traveler. That has not changed in 2026.
• 2. This applies to liquids, gels, aerosols, creams, and pastes. Not just shampoo and lotion. Peanut butter, yogurt, and gel candles all count too.
• 3. The bag itself must be clear and resealable. A standard quart-size zip-top bag works. A gallon bag or an opaque pouch gets flagged and slows down the line.
• 4. TSA PreCheck does not skip this rule. PreCheck speeds up the line and skips shoe removal, but liquids still follow the 3-1-1 rule at a standard PreCheck lane.
• 5. Checked luggage does not have the same size limit. Full-size bottles are fine in a checked bag. Large liquids just cannot go in the carry-on.

The CT Scanner Exception, Explained

This is the part most travelers have not caught up on yet.

• 6. Some airports now use CT scanners instead of flat X-rays. These create a detailed 3D image of your bag. At those lanes, liquids and laptops can often stay packed inside your carry-on.
• 7. The rule itself has not disappeared, only the screening process. You still need containers under 3.4 ounces in a quart bag. The scanner just means you might not have to pull the bag out.
• 8. This is currently rolling out at major hubs. That includes Atlanta, JFK, LAX, O’Hare, Dallas-Fort Worth, Boston, Denver, and Orlando, with more airports being added.
• 9. Not every lane at those airports has the new scanner. A checkpoint might have some lanes with CT scanners and other lanes with older equipment side by side.
• 10. Follow the officer’s instructions on the day. If a lane asks you to remove your liquids bag, do it, even if you flew through a CT lane at a different airport last month.

The 11 Exempt Categories

• 11. Baby formula and breast milk are exempt in any quantity. This applies even if the traveler is not flying with an infant.
• 12. Liquid medication is exempt with documentation. Keep it in the original container. A doctor’s note is not required, but the original pharmacy label helps at the checkpoint.
• 13. Hand sanitizer is exempt up to 12 ounces. This exemption is larger than most travelers expect.
• 14. Contact lens solution is exempt. It falls under the medical necessity category.
• 15. Other medical necessities are covered too. This includes items like insulin and other liquid medical supplies a traveler depends on.
• 16. Bring the exempt items separately from your quart bag. Declare them to the officer rather than burying them inside your regular liquids bag.

“The rule that trips people up is rarely the one everyone knows. It’s the exception nobody checked.”

Special Cases That Catch Travelers Off Guard

• 17. Duty-free liquids need to stay sealed with the receipt visible. A bottle bought after security, like the rum picked up at a Bahamas cruise port, only clears a connecting flight if it is still sealed in its original tamper-proof bag with the receipt inside.
• 18. A connecting flight can undo a duty-free purchase. If a traveler has to clear security again at a connection, an opened or unsealed duty-free liquid over 3.4 ounces can be confiscated at that second checkpoint.
• 19. International liquid rules are not identical to U.S. rules. Some European airports with CT scanners now allow containers up to two liters. That does not carry over once flying into the United States.
• 20. Large aerosols are not automatically banned, just restricted. Aerosols under 3.4 ounces can go in a carry-on. Larger ones often can go in checked luggage instead, usually with a protective cap and a quantity limit.
• 21. Some aerosols are prohibited entirely, in any bag. Flammable or hazardous sprays fall into this category regardless of size or where they are packed.

What Actually Happens at the Checkpoint (22-25)

• 22. There is no fine for an honest mistake. If a liquid is over the limit and not exempt, the officer will ask you to either discard it or go check it, if there is time and a checked bag available.
• 23. If there is no time to check it, the item is gone. It gets surrendered at the checkpoint. This is the single most common reason travelers lose toiletries at security.
• 24. Pull the quart bag out at a standard lane, even if you flew through a CT lane last time. Placing it in its own bin, separate from the rest of your carry-on, helps the screening move faster at older checkpoints.
• 25. Sign up for a travel rewards card that includes TSA PreCheck or Global Entry. Faster lanes still follow the same liquid rule, but a shorter line means less pressure if a bag needs repacking. Compare the best travel rewards programs to see which ones include the application fee credit.