There is a great small business story in the link below, and good advice on packing perishables for shipping.

http://blog.ups.com/2011/05/31/easy-as-pie-packing-and-shipping-with-the-ups-store/

"Poehnelt bakes the pies, freezes them and seals them in plastic to stay fresh. She takes them to Heil’s The UPS Store  where he places each pie in a 12 x 12 x 8 box with a 2-inch foam base. Dry ice is packed in the vacant space in the foam that sits under the pie. A second piece of plastic foam on top secures the pie in place.  He then ships them UPS Second Day Air."