Understanding what items you cannot bring on flights is crucial for smooth travel. Prohibited items typically include explosives, flammable materials, and sharp objects like knives. Liquids over 3.4 ounces are restricted unless in TSA-approved containers. Additionally, firearms and certain sporting equipment may require special handling or are outright prohibited. Check airline and TSA guidelines before packing to avoid delays and ensure compliance. Packing smartly with a focus on safety and adherence to regulations helps streamline airport security processes and ensures a hassle-free travel experience for everyone onboard.