Once you are signed up as a Books by Mail Library patron, any book, DVD, Book on CD, or CD you request will be sent to your home in a Library Canvas Mailbag through the U.S. Postal Service. You are only limited by what can fit in this bag, although some items, such as oversized books won't be able to be delivered through Books by Mail. Once the items are mailed to your home you have 28 days to enjoy and then return them.
Just like items checked out in the library, your items are able to be renewed if no one else is requesting them. However, you'll need to return all your items together - if you received five items you can't just keep only one.