I always sleeve them in clearfile, or printfile and then contact them while in the pages (well, for 4x5 I do 1:1 'enlargements'). I put the contact pages in front of the neg filer page in a 3 ring binder, one or two 1" or 1.5" er year binders.
I just ordered 200 pages of 35mm and 300 120 3 vertical rows of 4 for 6x6, to drive home to me that I have so much film in the freezer. Plus I am dreaming about early retirement, so I am trying to bone up on long lasting supplies while I still have income for the hobby without my wife asking too carefully where the money is going.