If you are thinking about a panoramic format, possibly a 7x14 would be of interest. It is a 11x14 piece of paper divided in half, which can conveniently contain a 5x12 with 1 inch borders or a 4x10 on the same sheet of paper with generous margins. As you point out, anything large becomes problematic in terms of both the paper stock and the basic portability of the folio. I have always felt that folio approach toward presenting prints is better confined to smaller prints meant to be handheld for viewing.
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