Watch your bags and don't accept packages from strangers. Report unattended packages and bags to authorities. Honestly answer questions about who packed your bags and whether you might have left them unattended at any time. A yes response will lead only to a little extra scrutiny of the bag. Don't make jokes about having a bomb or a firearm in your possession.
Penalties can be severe, including prison and fines.
Wait to wrap. If airline security personnel cannot determine by X-ray the contents of a package, they can and will open it or ask you to open it for inspection. Leave your firearms at home. Do not pack fireworks, flammable materials, household cleaners or pressurized containers. The Associated Press.