My approach is to put all notes in individual Mylar sleeves. Then, I have several cardboard boxes that are about 1cm wider (on the inside) than a Mylar sleeve is long, and they store about 100 sleeves or so. I set the boxes in my safety deposit box such that the notes inside are standing vertically, not stacked atop each other. I've got a very large box at the bank, so I can fit about 8 of these boxes inside without difficulty. These small boxes are also great for transporting notes. They are discrete, a reasonable size, and great for organizing your collection into different groups.
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BWJM, F.O.N.A.
Life Member of CPMS, RCNA, ONA, ANA, IBNS, WCS.
President, IBNS Ontario Chapter.
Treasurer, Waterloo Coin Society.
Show Chair, Cambridge Coin Show.
Fellow of the Ontario Numismatic Association.