I am not a big fan of those portfolios where you just stuff a pile of drawings into the pocket inside. They are great for transporting work (which is what they were originally meant for, as the word implies) and for storing it to some extent, but I prefer an easy way to see all the content. Enter presentation display books. I do my best to keep my house a 99% plastic-free zone, but there have to be exceptions.
These presentation folders keep drawings and paintings protected and organised and more visible (and almost flood-proof, though unfortunately when my house was flooded, most of my work was not in plastic pockets ), and they are particularly useful for work that is in a certain sequence, such as illustrations. I can also tuck notes and preparatory sketches into each pocket along with the main artwork, so everything is kept together and I can access it easily. I have them in A3 and A2, which are probably the most common sizes - it may be harder to get A1. The cover usually also has a clear plastic pocket, so you can customise it easily.
(I also love architects' chests of drawers. I have something that comes close to it, but I would love to have the real thing - very thin drawers).