It can be as simple as a clear plastic sandwich bag. If you plan to carry liquids on a plane, they do need to be in a clear plastic bag that is quart size at it's biggest.
Is toothpaste considered a liquid by the TSA? Yes, toothpaste must adhere to the 3-1-1 rule for liquids and gels. Toothpaste can be brought through TSA security in your carry-on as long as it is 3.4 ounces (100 milliliters) or less and placed in a 1-quart bag.
For the TSA, which regulates travel in the United States, all liquids, gels, and aerosols must be in containers that are 3.4 ounces (100 milliliters) or less. All liquids must fit into a single, clear quart-size bag — passengers can only pack one of these bags in their carry-on.
TSA counts mascara as a liquid, so the 3-1-1 rule for packing it in hand luggage applies. It states that all liquids have to be in 3.4 oz (100 ml) bottles or smaller and packed in a 1-quart bag.
In reality, TSA allows passengers to use slightly oversized quart-size bags. If the bag is transparent, resealable, and doesn't look much larger than a 1-liter Ziploc bag, it will be allowed.
You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes in your carry-on bag and through the checkpoint. These are limited to travel-sized containers that are 3.4 ounces (100 milliliters) or less per item.
Your backpack will generally be allowed as a carry-on if it's under 50 liters, or about 22 x 14 x 9 inches. Get a 45-liter backpack if you want to carry as much stuff as possible on the plane with you.
Normal backpacks or daily backpacks have volumes where you can easily fit small items that may be needed at work or school during the day. Their volumes vary between 15 liters and 30 liters.
The TSA rules allow for lipstick to be considered a solid, not a liquid or gel, which means that you do not have to take it out of your carry-on during the security check.
You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes in your carry-on bag and through the checkpoint. These are limited to travel-sized containers that are 3.4 ounces (100 milliliters) or less per item.
Are gels, creams, and other semi-fluid liquids counted, or are they exempt? The bottom line is that basically anything with moisture is considered a liquid and must abide by the 3-1-1 rule. Aerosol containers, like certain setting sprays, are also covered by this rule.