Avoid bringing anything What Not to Pack in Your Carry On Bag? To ensure a smooth travel experience. Avoid using liquids that are larger than 100 milliliters, sharp items like blades or scissors, and combustible items like aerosol cans or lighters. To enjoy a stress-free travel experience and quickly pass airport security, avoid packing these goods. Don't forget to verify airline policies for any particular limitations prior to preparing your carry-on luggage.