Shipped securely in a rigid cardboard mailer with padding for protection. I secure books to the interior of the mailer so they do not move around during transit.
I do combine shipping by weight. Just add the items you're interested in to your cart and click on the "Request combined shipping" link at the top. I will then send you a combined invoice (this can only be done from a PC currently, the mobile app doesn't show the link unfortunately).
Or feel free to purchase all items separately and I will give you a refund for the shipping difference.
If you just want a shipping estimate before committing, contact me with your zip code and all items you're interested in.