From the website:
Enjoy a handpicked selection of 40 amazing books from various categories around the store. You'll receive a range of fiction, non-fiction, history, cookery, lifestyle, mindfulness and so much more. There won't be any children's books in this box. Selection varies from box to box.
There's a free book bag with every order, shipping is free Australia-wide and it all works out to be $2.50 per book.
Full disclosure: I am affiliated with the store, but thought you guys might still like to know about the deal :)