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Julie Vognaryou can get Mylar (acid-free, acid protective, no softeners-archival, in fact)) sheaths of all sizes from Mark Macrae, and archival sheets to hold the Mylar sheaths at Subway Stamp Shop, 1-800-221-9960, ask for Lighthouse Vario Stockpages, 2-pocket, four (to a side) pocket--etc. black or clear centered, 3 and 4 holes, then all you need is a three ring binder, which you can get from them, or your loocal dimestore.
I only use those semi-soft or hard holders if I'm mailing or transporting something.