Yes, please look for the larger size if you are going to get them. The regular sized ones do not fit on many textbooks. I've had to send some of them home because kids try to get them on the book and then the cover doesn't close because they are so tight.
so true about the paper bag! That's what I've been telling DD and DH did make her a few paper covers last year. This year however, her school supply list has 2 book sox on it Think I will email the teacher and request to use the paper ones.