When packing your carry-on bag What Not to Pack in Your Carry On Bag? It's crucial to know what items are not allowed to avoid delays and ensure security compliance. Avoid packing liquids exceeding 3.4 ounces, sharp objects like knives or scissors, flammable items such as aerosol cans, and firearms or weapons of any kind. Additionally, refrain from bringing perishable foods, large sporting equipment, and illegal substances. Always check the TSA guidelines for the most up-to-date restrictions before traveling.