The Book Buddy is a cushioned protective sleeve for your book. It will keep your book safe when you're on the go, and it is sized so that you can also fit your phone and a pair of earbuds in it with your book. Alternatively, you could use it to keep your e-reader, tablet, notebook safe.
The Mini size will fit some paperbacks, all mass market paperbacks, e-readers (such as kindle or nook), and small tablets.
The Large size will fit all paperbacks, most hardcovers, tablets, e-readers, and have enough space for your phone or a small notebook.
The XL size will fit all paperbacks, hardcovers, some small laptops, and some small textbooks.