one box is similar to the UPS Express Box and can fit into the UPS drop box. the other is 10.75 x 8.5 x 5.75. The flat rate box "shipping kit" includes the box, a UPS pouch, an activation code, tracking, shipping document, and shipping instructions. there will be a special website to access with answers to questions and to activate the box. We are testing in two markets, Tucson, AZ and Raleigh, N.C. from October 2010 through January 2011. The boxes can be purchased at Walgreens, Costco, UPS Stores. cost is 11.99. weight limit of 70 pounds.