Talk to your student about keeping textbooks safe. Show your student where to keep the textbooks at home; tell the student to always put the textbooks back after using.
Cut off the bottom of a large paper bag, which you can get for free from the grocery store. (Other sorts of heavyweight paper, such as butcher paper on a roll, also will work.) Start by cutting off one corner and then cut off the entire bottom of the bag. Cut down one of the seams of the bag to create one large flat piece.
Turn the bag so the side with writing is facing up. Put the textbook in the middle of the bag. Open the front cover.
Fold the top and bottom of the bag to cover the book. The bag should cover the entire length of the book with only a few millimeters extended out over the cover. Center the book on the bag. Fold down each side and crease the sides. Place the ends over the cover on both the front and right cover. The fit should be snug so that the cover stays in place.
Give your student markers to write the name of the book and the child's name on the book.