It also helps to know which items are, according to the TSA, considered liquids or gels and thereby subject to the 3-1-1 rule. This isn't as simple as it sounds. Foods such as peanut butter, pudding, mashed potatoes, and icing are classified as gels. Mascara, lip gloss, and aerosol items are also classified as liquids or gels. But keep in mind that liquid prescription medication is exempt. (Read more on that on The TSA Blog.) See a more complete list of liquids and gels that are not permitted in carry-on luggage in quantities greater than 3.4 ounces here.
“I’m a firm believer that everything you need for a trip — whether it be three days or three weeks — should be able to be packed in a carry-on. This is simple once you master the art of layering your clothes. Choose a color combination for your attire and pack only pieces that match this so that you can mix, match and layer to create different looks (instead of packing completely separate outfits).”
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