Liquids, gels, and aerosols must be in 3.4-oz (100 ml) containers inside one quart-size bag in your hand luggage.
That small number—3.4 ounces—drives nearly every packing decision at the checkpoint. This guide shows what fits the rule, what doesn’t, and the common traps that slow travelers down. You’ll see clear, item-by-item calls so you can pack fast and breeze through screening.
3.4-Ounce Rule For Hand Luggage: Quick Checks
Think in two parts. First, does the item count as a liquid, gel, aerosol, cream, or paste? Second, is each container 3.4 ounces (100 milliliters) or less and placed in a single quart-size, resealable bag? If the answer is yes on both, it can ride in the cabin. Oversized containers belong in checked bags or stay home.
Fast Reference Table
Use this table for fast decisions. It groups the most common items by how they’re treated at the checkpoint.
| Item Type | Carry-On Status (3.4 oz) | Notes |
|---|---|---|
| Toothpaste, lotion, shampoo | Yes, under 3.4 oz | Pack inside one quart-size bag. |
| Sprays and aerosols (deodorant, hair spray) | Yes, under 3.4 oz | Pressurized cans count as liquids for screening. |
| Solid deodorant or bar soap | Yes | Not part of the liquids bag. |
| Food spreads (peanut butter, hummus) | Yes, under 3.4 oz | Thick or “goopy” foods count as gels. |
| Drinks and sauces | Yes, under 3.4 oz | Place in the quart-size bag for screening. |
| Duty-free liquor or perfume | Usually no | Large bottles are restricted at U.S. checkpoints. |
| Powders (protein, makeup) | Yes | Over 12 oz may get extra screening; pack smaller where you can. |
| Medically necessary liquids | Yes | Allowed in larger amounts; declare at screening. |
| Baby needs (formula, breast milk, juice) | Yes | Larger amounts allowed; remove for inspection. |
What Counts As A Liquid, Gel, Or Aerosol?
Liquids are obvious—water, drinks, toners. Gels and pastes include toothpaste, creams, ointments, hair pomade, peanut butter, and similar textures. Aerosols are spray cans such as deodorant, dry shampoo, and hair spray. If it pours, spreads, smears, pumps, or sprays, treat it as part of the liquids bag and keep each container at 3.4 ounces or less.
Edge Cases People Ask About
- Stick deodorant and bar soap: treated as solids, so they stay out of the liquids bag.
- Makeup: liquid foundation, mascara, and lip gloss live in the liquids bag; powder compacts do not.
- Wet wipes: not considered liquid for screening.
- Frozen ice packs: fine when totally frozen; if slushy, they get screened like other liquids.
- Liquid foods: yogurt, pudding, and soups are subject to the 3.4-ounce cap for the cabin.
How To Pack The Quart-Size Bag
Pick a clear, resealable one-quart pouch. Travel bottles should be 100 milliliters or 3.4 ounces each. Label them so you can see volumes at a glance. Keep the pouch near the top of your carry bag. Officers may ask you to remove it; easy access speeds things along.
Smart Bottle Strategy
Decant big bottles at home. Many popular toiletries come in 3-ounce refills. Tight caps and tape rings prevent leaks. If you need several small items, group shapes that nest so the bag seals without strain. A crowded quart bag can split, and that delays screening.
Exceptions That Allow Larger Amounts
Two common categories break the 3.4-ounce pattern. The first: medically necessary liquids, gels, and aerosols. The second: nourishment for infants and young kids. Bring what you need for the trip and tell the officer you have items over the limit. These items travel outside the quart bag. Expect a quick check—often a swab of the container—and you’re done.
Medical Needs
Items such as liquid medication, contact lens solution, liquid nutrition, and gel cold packs for medical use can travel in larger sizes in the cabin. Pack them where they are easy to remove, keep labels visible, and let officers know at the start of screening. For complete language straight from the source, see the TSA page on medical allowances.
Feeding Babies And Toddlers
Formula, breast milk, toddler drinks, and puree pouches can exceed 3.4 ounces in your hand luggage. These items do not need to fit inside the quart-size bag. Remove them for inspection and expect the same simple check used for medical items. TSA spells this out on its page about breast milk, formula, and juice.
Aerosols And Sprays In Small Cans
Travel-size aerosols such as deodorant, hair spray, or dry shampoo are allowed in the cabin when each can is 3.4 ounces or less. Keep them in the quart-size bag since sprays count as liquids for screening. In checked bags, separate rules limit the total quantity of toiletry aerosols. Stay with consumer-size cans and you’ll be fine for typical trips.
Powders And Granules
Most powders can ride in hand luggage with no size cap. Packs larger than 12 ounces (350 milliliters) often get extra screening. Place big tubs in your checked suitcase if you want to avoid that extra step. Protein powder, flour, spices, and makeup powders all fall under this screening note.
Duty-Free Liquids On Multi-Leg Trips
Large bottles from an international shop can be a hassle on U.S. connections. Rules at the checkpoint still hinge on the 3.4-ounce limit, even when the bottle sits inside a tamper-evident bag. Many travelers move those purchases to checked baggage after customs to avoid a snag before re-entering security.
Food And Snacks In Hand Luggage
Solid foods travel well in the cabin. Sandwiches, chips, and whole fruit pass screening without volume caps. Sauces, salsas, gravies, and similar items count as liquids or gels for screening and must stay at 3.4 ounces or less per container to ride in the cabin. Peanut butter, cream cheese, and soft cheeses follow the same rule.
Electronics, Batteries, And Liquid-Adjacent Items
Power banks and spare lithium batteries must stay in carry-on bags. E-cigarettes and vape pens live in hand luggage too. Bottles of e-liquid up to 3.4 ounces can sit in the quart-size bag. Keep laptops and tablets easy to remove if your lane asks for it; checkpoints with advanced scanners may not require removal, but lanes differ by airport and day.
Sample Packing Layout That Works
One front pocket holds the quart-size liquids pouch and your travel-size aerosols. A small cube carries solids: stick deodorant, bar soap, solid perfume, and powder makeup. Medical items sit in a clear zip bag with a note on top. Baby items live in a separate tote for quick removal. This layout keeps you moving even when the line is busy.
Common Mistakes That Trigger Bag Checks
- “Travel size” label, oversized volume: some bottles say “travel” yet hold more than 3.4 ounces. Check the fine print.
- One giant toiletries pouch: only one quart-size bag of liquids per traveler. Split across people in your group if needed.
- Duty-free on a connection: big perfume or liquor bottles often get stopped at U.S. checkpoints between flights.
- Half-frozen gel packs: slushy packs are treated as liquids until fully frozen.
- “Soft” foods: spreads and dips count as gels for screening even when sold as snacks.
Carry-On Rule Myths, Debunked
“100 Ml Means Total Bag Volume.”
The limit applies per container, not to the sum of all your liquids. The quart-size bag controls how many small containers you can bring, but each one must still be 3.4 ounces or less.
“Travel Size Doesn’t Need The Bag.”
Small containers still belong in the clear pouch. Packing them loose often triggers extra checks.
“Duty-Free Bags Are Always Fine.”
Many travelers assume the shop bag guarantees passage through any checkpoint. Rules at U.S. screening points still use the same 3.4-ounce threshold, so large bottles can get stopped on connections.
Example Kit For A Three-Day Trip
Here’s a simple, leak-safe set that meets the cabin rules without drama.
| Item | Quantity | Why It Works |
|---|---|---|
| 3 oz shampoo + 3 oz conditioner | 1 each | Both inside the quart-size bag. |
| Toothpaste 0.85–1 oz | 1 | Small tube lasts a long weekend. |
| Facial cleanser 2–3 oz | 1 | Meets the per-container limit. |
| Moisturizer or sunscreen 1–3 oz | 1–2 | Pick sizes that fit your pouch. |
| Dry shampoo spray 3 oz | 1 | Counts as a liquid; keep in the pouch. |
| Stick deodorant (solid) | 1 | Pack with your solids; no bag slot needed. |
| Makeup: mascara + gloss | 2 items | Both are liquids for screening. |
| Powder compact | 1 | Not a liquid; leave with solids. |
Quick Checklist Before You Zip Your Bag
- Only containers up to 3.4 ounces in the clear pouch.
- One quart-size bag per traveler.
- Medical liquids and baby items travel outside the pouch—declare and present them.
- Sprays and pump bottles count as liquids for screening.
- Large powder tubs may draw extra screening.
- Move duty-free bottles to checked luggage on U.S. connections.
Why The 3.4-Ounce Limit Exists
Air travel security adopted small liquid limits around the world after liquid explosive plots were stopped in 2006. The per-container cap plus the quart-size bag keeps risky mixes out of the cabin while letting travelers bring daily toiletries. The rule has held steady in the U.S., so plan around it unless the official guidance changes.
Official Sources You Can Trust
The policy lives on TSA’s page for the 3-1-1 liquids rule. For medical items and infant nourishment, see the TSA pages linked above. Rules can change by country, so check your departure and transit airports if you’re flying abroad.