Here's one of those changes in the world that make me feel old; good quality large Artist portfolio folders - the kind generations of paper-using #GraphicDesign students used to have to carry, seem to be almost impossible to find now.
Requirements are A2, ballistic / woven nylon type fabric, stiff self-supporting sides, 3 side zip, handles on the opening / non spine side, no sleeve binder rings inside.
Everything today is too flimsy, PU vinyl, handle on spine, binder rings.