Of course! Items such as chemicals, combustible materials, What Not to Pack in Your Carry On Bag? explosive substances, and alcoholic beverages above 140 proof should not be included in your carry-on bag. Avoid animal safety items as well as outdoor products. Recall the 3-1-1 rule when it comes to liquids: each item needs to fit into a 1-quart bag and be less than 3.4 ounces (100 milliliters).