I keep medical records chronologically and these are easy to put in order so I can grab a specific report (like our last lab workups) and compare to our current lab workups...
The 10" X 13" Brown Kraft Clasp Envelope in the 100 count box works just the way you would want a Brown Kraft Clasp Envelope to work. I mean you can put paper in it seal it and then file it or mail it. Who could ask for more?