If you keep your portfolio pieces in an archival box but need a cover to protect the box, then look at what Lightware has made especially for you.
Folio covers are handsome padded carrying covers that fit snugly around archival presentation boxes. They come with a handy buckle down closure and will cover 16x20, 11x14 and 8x10 archival presentation boxes.
They can also be used as a soft side briefcase, small light table cover, stuff sack or a folio for whatever your imagination chooses. An optional padded shoulder strap may be added to any one of these covers.