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A Ziploc bag is perfect if you can find one large enough; add extra padding by sealing a Ziploc bag most of the way, inserting a drinking straw into the gap, blowing air into the bag, then quickly sealing the bag shut to keep the extra air inside. Plastic newspaper delivery sleeves are also the right size for many books. Put the book in the bag, fold over the top of the bag, and seal it with packing tape. Otherwise, wrap the book in a grocery store produce bag or other plastic bag and tape the edges closed. Cut two pieces of plain cardboard that are slightly larger than the book. Sandwich the book between them to protect the cover. Use plain cardboard rectangles, as cardboard with print or stickers may stick to the book or transfer print onto the cover. Wrap brown paper, newspaper, or wrapping paper around the plastic and cardboard protectors, then tape it in place. This secures the cardboard in place and helps keep the book clean.
Wrap the books in plastic to protect them from water damage. Sandwich the books in cardboard to keep them from getting bent. Wrap your books in paper.