I don't use any special boxes. Each 4x5 negative is in a polyester sleeve that goes in an envelope. I don't shoot 120 so no idea, but I assume they'd be very similar to the 35mm AM sleeves, which I do use. For LF I used to like the frosted Mylar fold-lock sleeves I'd get from Light Impressions but they got harder and harder to get.
Originally Posted by Rafal Lukawiecki
To me, the smaller formats are where these systems are most useful simply because the enlargement factor is greater. Even "micro scratches" barely visible to the eye on the negative can sometimes cause problems.