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.