The Postal Store: "Introducing a quick, easy, and convenient way for you to ship Priority Mail packages. The Postal Service has simplified the Priority Mail shipping process by introducing two new Flat Rate Box options - items that feature a predetermined rate regardless of the weight or destination zone of the package, similar to the Flat Rate Envelope. A few key benefits of this new product:
Any weight, any State, $7.70. No matter which Flat Rate Box you choose, the postage is $7.70, regardless of weight or destination.
No need for a scale. Visit Click-N-Ship to purchase and print postage from your home or small business computer. You don't need a scale.
No need for a trip to the Post Office. Visit Pickup Options to arrange for next-day pickup at no extra charge (available in most locations) using online Carrier pickup.
The corrugated box you have selected is similar to a shoe box (11' x 8-1/2' x 5-1/2') and holds merchandise such as model cars, and taller items. Both shapes have the same cubic inch dimensions. "

this is perfect for my shipments! now i just need a big bag of peanuts... i can probably save money by buying some ballons and blowing them up myself.