It's called the 3-1-1 liquids rule. Each item must be 3.4 ounces or less and must be able to fit inside a one-quart size clear zip-top bag. The limit is one bag per person. Typically, travelers put their toiletries in the bag such as shampoo, hair products, make-up and toothpaste.

Packing hygiene products for a flight in 2026 still follows the strict TSA 3-1-1 rule for carry-on luggage: all liquids, gels, and aerosols must be in containers of 3.4 ounces (100ml) or less and fit inside a single, quart-sized clear plastic bag. To pack efficiently, many travelers now use "solid" alternatives like shampoo bars, solid cologne, and toothpaste tablets, which do not count toward the liquid limit. If you are checking a bag, you can pack full-size bottles, but it is vital to "double-bag" them in Ziploc bags or leak-proof silicone sleeves to prevent a mess caused by cabin pressure changes. A popular 2026 tip is to place a small piece of plastic wrap under the cap of your bottles before screwing them back on to create an airtight seal. For electric toothbrushes or razors, ensure they are charged or have the batteries removed to prevent accidental activation in your luggage. By separating your "liquid" bag from the rest of your toiletries, you can breeze through security without having to dig through your entire suitcase.