You need to bubble wrap them to protect them from dents and dints. Preferably, then box them. If you can t box them, make cardboard corners to stop the sharp corners poking through the packaging and getting damaged or tearing the packaging.
bubble wrap jiffy bags are fine - you can get them from the post office - in terms of size - any will do as long as the book fits!
I wouldn t use an envolope. It would either be too small or too weak. I would use bubble wrap and put them in the right size box. :)
