That's also why it's important to squeeze any air out of a Ziploc baggie before putting it in checked luggage. Remember: gas expands and contracts under pressure, liquid doesn't. There you go, folks.
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Place the wrapped bottle or container in the middle of your largest suitcase, surrounded by clothing and other soft items. A variation on this method involves using a hard-sided plastic or cardboard container to protect your liquid item. Use a small cardboard box or a sealed plastic container.
If the bag is transparent, resealable, and doesn't look much larger than a 1-liter Ziploc bag, it will be allowed. You'll only encounter problems if your toiletry bag looks way too large or if you encounter a very strict officer, but this happens rarely.
You are only allowed to bring one quart-sized (dimensions: 7” x 8”) bag where you'll store all your 3.4 ounces liquid containers. ? 1 = Refers to the maximum number of persons per quart size bag. Each person flying may only carry up to 1 quart size bag.
The capacity of each container must not exceed 0.5 kg (18 ounces) or 500 ml (17 fluid ounces). See the FAA regulations for more information. Permitted aerosol release devices (button/nozzle) must be protected by caps or other suitable means to prevent accidental release.
We recommend packing all liquids, gels, and aerosols that are over 3.4 oz or 100 ml in your checked baggage, even if they are in a secure, tamper-evident bag. Liquids more than 3.4 oz or 100 ml not in a secure, tamper-evident bag must be packed in checked baggage.
Toothpaste, regardless of container size, can be placed inside checked luggage. It is the size of the toothpaste tube that matters, not the amount of toothpaste in the tube.
Airports set limitations on the amount you can carry with you because they can't accurately identify the type of liquid inside bottles by only using their security screening equipment.
Any item that alarms or is unable to be screened will not be permitted in your carry-on bag. We recommend packing all liquids, gels, and aerosols that are over 3.4 oz or 100 ml in your checked baggage, even if they are in a secure, tamper-evident bag.
While not all batteries are prohibited in checked luggage, lithium batteries are considered hazardous and should not be packed in checked bags. If a lithium battery overheats and catches fire inside the cargo hold, the fire can quickly spread and become difficult to control.
The overall size of your liquids bag is limited to one quart (this is true in almost every country today), but how you pack it has an enormous impact on what you're able to bring in your carry on bag.
In checked bags, hairspray is allowed, but in 18 oz (500 g) containers or smaller. Each passenger can bring up to 70 oz (2 kg) of hazardous toiletries in total (aerosols, perfume, hand sanitizer, nail polish, etc).