For ordinary liquids on a plane departing through US security, use containers of 3.4 ounces or 100 mL or less. Put them in one clear, resealable quart-size bag. Each passenger gets one liquids bag under the standard 3-1-1 rule.
Liquids on a plane: size means container capacity
A mostly empty 200 mL shampoo bottle is still a 200 mL container. Pour the amount you need into a suitable bottle labeled 100 mL or smaller. Do not depend on a screener estimating how much is left.
The TSA liquids rule covers gels, aerosols, creams and pastes too. Toothpaste, sunscreen and liquid makeup need space in the same bag. A solid alternative can reduce the number of liquid containers you need.
Decide what actually belongs in the bag
| Item | Packing decision |
|---|---|
| Shampoo, conditioner, lotion | Travel-size containers in the liquids bag |
| Toothpaste or gel | Treat as a liquid rule item |
| Empty water bottle | Keep it empty through screening; refill afterward |
| Ordinary full-size toiletries | Check them if allowed, or leave them at home |
| Necessary liquid medicine | Declare separately; special screening rules apply |
A practical way to plan is to lay every liquid rule item together before filling the bag. That reveals duplicates, such as separate moisturizers packed in two different pockets. Close the bag normally rather than stretching it around an overfilled collection.
Medication and feeding supplies need their own check
Medically necessary liquids and qualifying infant or child feeding supplies have exceptions to the ordinary volume limit. Tell the officer before screening. Additional inspection may be needed.
Do not apply the ordinary toiletries rule to a necessary medicine and discard it without checking. Use the TSA’s current guidance for your exact item. Plan extra time if you need separate screening or an assistance arrangement.
Does PreCheck remove the limit on liquids on a plane?
No. A faster screening process does not create a bigger toiletries allowance. Follow the officer’s instructions about what to remove from your bag.
This distinction also matters for visitors using GateSide airport access. Going to meet someone rather than taking a flight does not make prohibited checkpoint items acceptable.
Check every security checkpoint on an international journey
A connection can involve another screening point. An item bought after your first checkpoint may face different treatment at the next. Check transfer airport rules before buying large bottles or duty-free liquids.
Keep the questions separate: security decides what can pass the checkpoint, while the airline controls your bag count and size. Start with your airline’s allowance if you are unsure where a toiletries pouch must fit.
Pack liquids on a plane without a last-minute repack
Use small containers, gather them in one bag and put that bag somewhere accessible. Pack spill prone items upright where practical. If you also have snacks, check which foods count as liquids or gels before using the remaining space.