I don't use a book.
My small prints are on paper that's up to 24” on the long side. I mount them using Lineco clear mounting corners on slightly over sized foam core (26” x 14”) and use clear plastic bags to cover the prints. The combination gives the prints a lot of white space, plus the ability to place in a print bin. The prints travel well, people can and do hold the works up individually, plus I put a brief explanation and bio on the back of each piece.