Adjustable Travel Book & Bible Cover, Washable & Reusable Protective Sleeve for Paperback Hardcover, AA Book Harry Potter, Book Lovers Gifts, 9.4"x7"x2"

I use this one for most of the standard sized Folio's (I did end up cutting off the strap): https://www.amazon.com/dp/B0FDKZ3VP2 The leather ones I bought years ago but fit similar to the cloth one above. I sometimes use these cheap, disposable ones for odd size books (I also cut the elastic at the spine if they close too tight): https://www.amazon.com/dp/B07WTTSNMR