Messenger / Courier Bags List

This is all so cool guys, but one thing I am really intrigued about is the main strap positioning, is there any reason why you are going across the top two corners as opposed to diagonally? (e.g. for a left shoulder bag it would typically go from top left corner to bottom right corner).

I do not think there is anyone doing what you describe (from a top corner to the opposite bottom corner). I don't know whether that's because the bag would be unstable or whether it's never been tried. In practice I suspect you could not tighten the strap and keep the bag stable at the same time, but I haven't made a bag yet ;)