<p>When I send in supplementary application material such as a resume and/or S.O.P, should I send them in a normal letter envelope or a larger manila envelope so that nothing has to be folded?</p>
<p>It makes no difference whatsoever.</p>
<p>Looks more professional in a manila folder.</p>
<p>No difference. Do what you’re comfortable doing. I mean the postage cost won’t be that much different wouldn’t it? :)</p>