Additional Envelope for 2 way courier service?

[aspirecanada2021]

Hi,

I wanted to know if we need to keep additional envelope (for returning passport) in the package which we send to VFS for visa stamping in USA?

The documents which we need to keep in the package are:

1. Passport
2. Passport Request Letter
3. 2 way courier service Application confirmation letter

Are there any other documents we need to keep in the package?

Any guidance is deeply appreciated...