Quote Originally Posted by Wayne View Post
I never used the inner envelope when sending film in, and I've never had a problem.
Ditto.

Also, regarding tape. The kind folks at my former (RIP) lab asked that the boxes not be taped up excessively. I used masking tape (small strip on two sides) and rubber bands to hold my processing instructions. Never had a problem.

If not previously mentioned, make sure the box is indelibly marked with your name, address/phone and instructions to return the box. I've only rarely had them not do that anyway, but I don't shoot enough film to make lots of boxes so I need to keep what I have.