i am a neat freak as well, and when it came time for my spouse K-1 interview, I prepared all the evidence in clear plastic folders and sent it via Fedex at a cost of over $300.00 for the package. Once at the interview they asked for only 3 sheets of what he brought. The next time for the US Embassy interview, for the spousal visa, whatever I needed to send from the US I just sent via an email, including pictures, which were printed in his country. Total cost of printing $10.00. All the documentation was in one single envelope and once again of all he brought they only took and reviewed 3 pieces and the rest they never looked at it. My comments that if you want to do binders for your own piece of mind, go ahead but once at the Embassy they will ask and take only what they want to see.