Wow, I was simply giving some information to help those that may not know what is looked at routinely, hence the reason I posted the images link, and then explained what many items that generate bag checks would be. I did not imply it is your responsibility for anything, I was giving information in the hopes that someone here may better understand what a bag check was called for. If it was interesting enough to you, you could see image representations in a simple google search. Items that are outside of the regular items in passengers bags (and even some regular items, see the previous comments on the water filters - some of them look like pipe bombs on xray) may look like a possible threat item on the xray, that was the essence of the statement by Bob. Big difference in what your commentary says, and what I have said.