Check out
www.brewer-cantelmo.com for custom portfolios. They have a variety of types, sizes and colors. They are heavier duty than most, and travel well. I have seen many with names embossed on the front and matching bags with shoulder straps that save your back. For consumers viewing your book, they recommend prints in plastic pages,(easier to flip through and less likely to get damaged) but for showing to fine art galleries a box is perferred with loose prints.