Recently bought a small keychain multi-tool: Screwdriver, pliers, tiny scissors. And, unlike dangerous bladed weapons such as these: TSA compliant, meaning it's OK to take on a plane. It made me curious, though, about the current TSA regulations. What is and isn't OK to take on a plane? Tables found here: http://www.tsa.gov/travelers/airtravel/prohibited/permitted-prohibited-items.shtm Apparently it's completely legal to carry a 7" bladed screwdriver onto a plane, as they're clearly not a stabbing implement. You can also bring your Craftsman wrench with you, as that's clearly a tool, and not something that could be used to bludgeon someone. A pen, on the other hand, could land you in some serious trouble if it's a "tactical" pen. Does this make absolutely no sense to anyone else?