It’s entirely proper for books and frankly most rigid things to be packaged in cardboard and nothing else these days.

From my own experience I am quite sure that the club will deal quickly with any damaged items but I would strongly object to things being wrapped in an extra layer in case of circumstances which will affect zero-to-few recipients.

If you live in a place where packages are typically left outside then perhaps you should provide somewhere for your postal workers to leave stuff in the dry.