So far I have used these for filing 120 format negatives. I found that they did not always fit into the wallet as the glued section was not quite right but it did come unstuck quite easily. Have not tried inserting other format negatives yet. I was a bit disappointed that these wallets are not A4 size but slightly bigger in width so will probably have to purchase the clip folders as well. This is because two 120 negatives side by side are bigger than A4. Filing them vertically would mean only 6 negatives will fit in.