Get a portfolio folder that is meant for artists. I use this one; https://www.amazon.com/X-Port-Professional-Advertising-Photography-Presentation/dp/B00JBGC0SY/ref=sr_1_2?crid=8H4R17DJ3HOG&keywords=X-Port+Professional+Expandable+Art+Portfolio+Case&qid=1662040555&sprefix=x-port+professional+expandable+art+portfolio+case%2Caps%2C131&sr=8-2
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It holds all my targets but the downside is I now have so much crap in it that its pretty heavy.