Updated July 2026 · Checked line-by-line against TSA's own rulebook

TSA Liquid Size Limits: The 3-1-1 Rule in One Chart

By the Passport Pro Travel team — trusted by 100,000+ senior travelers

Most travelers believe the rule is about how much liquid you're carrying. It isn't — and that one misunderstanding fills a confiscation bin at every checkpoint in America. The rule is about the container, and once you see it that way, you'll never lose another bottle to security.

Here's the whole picture: the memory trick that makes the rule stick, the one chart that settles every "does this count?" argument, the exceptions written for travelers like you, and the mistakes that get seniors pulled aside. Everything below comes straight from TSA's published rules — not airport folklore.

What the 3-1-1 rule actually means

• 3 — each container holds 3.4 oz (100 ml) or less. The printed size on the bottle is what counts, not what's left inside.
• 1 — everything fits in 1 quart-size, clear, resealable bag that zips closed.
• 1 — one bag per traveler, out of your carry-on and into the bin.

So your half-empty 6 oz moisturizer still fails. The officer reads the label, not the level. Say it once and keep it forever: check the container, not the contents.

And there's no bottle count — if your quart bag zips closed, you're fine. That's about 6 to 9 travel-size bottles for most packers.

Why the rule exists (and why it's not going anywhere)

The 3-1-1 rule dates to August 2006, after authorities broke up a plot to carry liquid explosives onto planes. Small containers make X-ray screening reliable, so TSA locked the standard in. It has barely moved in twenty years. Learn it once — it will outlast your passport.

The TSA liquid size chart: what counts and what fits

The simple test: if you can spill it, spread it, spray it, pump it, or pour it, TSA calls it a liquid. Still unsure about something? Type it into TSA's own "What Can I Bring?" tool and get the official word in ten seconds.

The exceptions written for travelers over 60

Here's the part the sign at the checkpoint doesn't make nearly loud enough: your medications are exempt from the 3.4 oz limit. TSA's own policy allows liquid prescriptions, insulin, saline, nebulizer fluids, and medically necessary gels in reasonable quantities. Keep them out of the quart bag, lift them out of your carry-on, and tell the officer before screening starts. A doctor's note helps, but TSA doesn't require one.

Medically necessary ice packs for keeping medication cold are allowed even partially melted. The same exemption covers infant formula and breast milk, and duty-free bottles sealed in a tamper-evident bag (STEB) with the receipt showing.

One pandemic leftover that quietly ended: the 12 oz hand sanitizer allowance. Sanitizer is back to the standard 3.4 oz.

Quart bag size: what TSA actually accepts

Nobody at the checkpoint measures your bag with a ruler. The standard is roughly 7 x 8 inches — a sturdy freezer bag does the job, and reusable clear pouches are fine as long as they're fully transparent. Gallon bags get flagged.

And here's how it usually goes wrong: your liquids don't quite fit, so you split them into two bags. That second bag is the most common reason senior travelers get pulled aside for a secondary check. One bag per person. If it doesn't zip, something moves to checked luggage.

TSA PreCheck and the new scanners — same limit, better line

You've earned PreCheck-level patience, but neither PreCheck nor the new CT scanners changes the math. PreCheck lets you leave the quart bag inside your carry-on. Some big airports — Atlanta, JFK, LAX among them — run CT scanners that do the same for everyone. The screening feels smoother; the limit is identical. Plan for 3-1-1 everywhere and you'll never be the surprised one in line.

Checked luggage: where the big bottles go

The 3-1-1 rule stops at the checkpoint. Your checked bag takes full-size shampoo, sunscreen, and that anti-aging cream in the 5 oz jar with no per-container limit. Two caps still apply, straight from the FAA's hazardous-materials rules:

• Aerosols — 68 fl oz total per passenger, no single can over 18 oz.
• Alcohol — 24–70% ABV is capped at 5 liters per passenger; anything over 70% ABV is banned outright. Wine and beer under 24% have no formal limit.

What happens if your bottle is too big

No fine, no report, no drama — but you lose the item. The officer gives you three choices: surrender it, step out of line and move it to a checked bag if there's time, or exit and mail it home where airports offer that service. The line behind you will not enjoy any of these. Check your container sizes the night before, at the kitchen table, where the stakes are zero.

Do the same rules apply on international trips?

Every flight leaving a US airport follows 3-1-1, international departures included. The EU and UK run the same standard — 100 ml containers in a 1-liter clear bag. A handful of airports with new scanners have relaxed local limits, but that varies airport by airport, not country by country. The safe play for any itinerary: assume 100 ml everywhere, and keep duty-free sealed until you're home.

The Night-Before Rule: five minutes that save your toiletries

You're doing great — this last part is the easy one. Everything above compresses into one kitchen-table routine the night before you fly:

1. Lay out every liquid, gel, cream, and aerosol. Read the printed size on each one.
2. Anything over 3.4 oz goes in the checked bag now — not at the airport.
3. Swap what you can for solids: shampoo bars, stick deodorant, toothpaste tablets skip the bag entirely.
4. Zip the quart bag and park it at the top of your carry-on, one motion from the bin.
5. Medications: original labeled containers, separate from the quart bag, ready to declare.

That's it. For the deeper playbook — including 15 liquid hacks most travelers never hear about — read TSA liquid rules airlines don't advertise.

FAQ: TSA liquid sizes

Official source: TSA Liquids Rule · Related: TSA checked baggage rules · TSA medication mistakes