Cachet Fusion is a unique concept in blank books, combining the benefits of a sketchbook, journal, and portfolio. The back cover features a portfolio for storing work.Fusion folios offer three sizes with two different journaling options: The 5 1/4 in. x 8 1/4 in. folio features unlined pages for convenient sketching on the go; the 7 in. x 10 in. and 9 in. x 12 in. folios feature lines on the back of each page for handy documentation.The books are crafted with 70 sheets/140 pgs. of premium weight paper (120 gsm) with high brightness. The paper has an excellent surface suitable for all dry media and is milled with maximum opacity. Both the paper and back portfolio are acid-free. Each book has an elastic band closure for securing loose contents.