Free Size Book Cover Size: Free Size (Fits from paperback to A5 size) Adjustable to fit the size of your book. Pattern: Night Sky Material: Polyethylene fiber Weight: 23g Wrap your favorite books with your favorite design! Free size book cover, adjustable from paperback to A5 size. Made with DuPont Tyvek material, it's incredibly lightweight, almost like a paper cover, yet it's water-resistant, breathable, durable, and long-lasting. Strong and resistant to tearing, it's perfect for Hayakawa Bunko, softcover books, and even special sizes like foreign books. It's not just for books! It can also be used for ledgers, household accounts, planners, and notebooks, making your daily study time more enjoyable. It has fold lines on the vertical and horizontal sides that correspond to the main book sizes, making it easy to use even for beginners. Reusable, so it's great value for money. Enjoy your reading life with your favorite cover! Brand new, unused, and unopened. Please refrain from purchasing if you are sensitive to minor imperfections.