I don't think the PBS wrapper will fit on a trade size book.  I always either use a bubble mailer or I wrap in brown kraft paper and just print out the one page sheet with the address on it to use.

The printed labels usually don't fit on a trade or oversized paperback so I usually find a different way to wrap it. A mailer envelope would definatly do the trick. Welcome to PBS . Hope you have fun here. :)

You don't have to use the PBS mailer for any books. I don't. Everybook I get using the PBS mailer comes through looking all beat up on the outside. So far none have been damaged but I'm sure that will happen.  I use manilla folders, Tyvek envelopes or bubble mailers.  Sometimes I use heavy duty packing type paper.  Make sure you tape well but not so much that it can't be opened w/o destroying the book.

In my experience, the wrapper works really well. What doesn't work is putting the book in an envelope too big for it - the book slides around and the envelope tears open.  When I use a manilla envelope, I always cut off the excess so it fits *and* use reinforcing tape on the sides.

I generally print out the second page and put it inside the package, that way if the outside of the package is damaged, there's an address inside.

I primarily use just the preprinted wrapper, and extra sheets of paper to wrap each book, but I also pre-wrap in plastic first, and I reinforce the edges with tape twice, once on the plastic wrapped book and also on the outside paper wrapper.  So far, no problems reported with those who have received my books, but I really do tape reinforce the packages well and I believe that the books I send out are better wrapped than those that have come to me in mailers and manila envelopes, which usually arrive to my place damaged if they haven't been tape reinforced.

I do agree with above posts that a tight fitting envelope usually has better success making it through the USPS process undamaged than books in a too-large envelope with lots of sliding room.