If the applicant has an application envelope from the school, use the school's; If not, just use it yourself. Usually I go to the post office to buy a large envelope, preferably a kraft paper envelope, which is strong. Applicants can also buy the 1 envelope with their own school logo, but it is more expensive. Then put all the application materials in.
Generally speaking, the envelope is sealed with glue, adhesive or double-sided tape. No matter what you use, you should apply more and stick it firmly.
Write the applicant's address in the upper left corner of the front of the large envelope and the address of the other school in the middle. Remember that the bottom line must indicate the country of shipment in Chinese, such as "America". You can also write some information about the applicant's application, such as the application for admission to XXX Department of XXX University in the fall of 20 15.
The words on the envelope can also be labeled, which looks beautiful. Labels can generally be printed in Word, and then the applicant can cut the printed note with scissors and stick it on the envelope with glue. Remember to wrap them tightly in case they fall off on the way. If you don't trust, just write it by hand.