I finally have my 4x5 setup completed and am about to give it a test run tomorrow. I seem to have a bit of a problem though. I'll be shooting B&W as well as a few 4x5 slides, but I will not be able to develop the latter, and so will have to take them to my local shop to get processed. I was wondering what you all put your unprocessed slides in when you drop them off. Surely I don't leave them in the holder and give that to the shop, do I? Thanks for any help you can offer!