Here we go again. We regulate the size and number of bags but we can't tell you what the size is! As a photographer, after the UK went through that crazy period of 1 carryon only, we were forced to buy ($700) compliant bags with a laptop sleeve in the front. We still use them (ThinkTank Airport International), as they work very well on all flights except CRJ's and ERJ's. But do we now have to change again? What is the mythical "TSA Approved" size. I say, if we can't have the dimensions then if flies and anyone who says otherwise is full of bs. This is way out of control.