I just got a 485 RFE (medical exams) from USCIS, coming with a very small envelope. In the letter, I was told to mail the RFEed materials back to them in this small envelope. But it is not big enough to hold all my materials. What to do? Please give me your advice. Thanks!!!! Also, I appreciate if anybody can kindly let me know the cover letter for RFE. Good luck to everybody here!