I used to attach Avery labels to Printfiles until they began detaching on their own, and who's to say about the archivability of the adhesive. Now, I just write in the margins (non-negative areas) with sharpies. I have kept negs from 35 to 5x7 for as long as 30 years in these things with no sticking. Frankly, my negatives only need to last as long as I am able to print them. Fine art prints are a different matter. Proper processing is your best bulwark for archivability.