
I have these to fit vintage envelopes in between. I am buying/selling a mail story and sometimes the cover (envelope) is bent or dented. I steam the lid and put it between 2 such sheets and clamp it between the boards for 12 hours. It does an excellent job of smoothing and drying the cover.

Premium Leather Folio Cover For Rocketbook Everlast & More β A5 Size Portfolio Organizer With Pen Loop And Multiple Pockets In Elegant Brown
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π Sizzix Adhesive Sheets: 6x6-Inch, 10-Pack - Premium Quality for Crafting & Scrapbooking
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