I use the 5x5cm (2x2") cardboard flippy things. They have a 39.5mm hole in the centre. Origianlly was going to use the 6.5x6.5cm (2.5" I think) with the 44mm hole but no-one here sells them or 12 pocket sheets. So...with the 2x2's I use heavy duty 4x5 plastic pocket sleeves which are kept in 300pge 3 ring folders (get about 12-14 sleeves to a folder)

Overall I'm very happy with the result. The chips are locked away free from dust & my sons fingers. I staple them all closed but I guess you could leave them open as the pockets hold pretty tightly. The only draw backs & minor problems I have are....

1. With the 39.5mm hole you can't see the chips edge. Thanks to Greg Susongs site I now look for rim variations..aaahhh!!
2. Slightly oversized chips (Australia seems to have alot) are a bit of a squeeze.

A couple of sheets from my folders below.

Cheers, Tim.