When in doubt—check it. If you're unsure about whether you can bring something in your carry-on, you're probably better off putting it in checked baggage instead of getting delayed at security. Most sports equipment, for example, is not allowed in carry-on baggage as it could potentially be used as a weapon. Examples of prohibited items include baseball bats, golf clubs, pool cues, ski poles, and hockey sticks. You can, however, bring aboard smaller items like baseballs and basketballs. Check the TSA's rules on special items for further clarification.