Not all carryon compartments are the same, jets used can change based on demand. That looks like one from a 767 or larger, recently was denied carrying a few pieces of metal on a flight because they could be "used as bludgeoning devices" - airport security has 100% discretion on deciding if they will allow something or not. Not being negative here, but think some people are going to have a nasty surprise after they miss a flight or pay a bag fee because of assuming generosity. Security and aviation companies are squeezing more and more and making it less and less comfortable to fly.