The box came with a separate bracket for holding an 8 1/2 x 11-inch sign. To attach it, I had to uncover the two strips of adhesive and gently press the bracket to the box. I then tipped the box on its back to better secure the bracket. To my annoyance, I saw that a little speck of lint had managed to slide up under the lower of the two strips. Fortunately, the glue hadn't hardened completely, and I was able to get up in there with a knife and pick the lint out before finishing the job. With a completely clear plastic box, there's no room to hide mistakes.
I will save the packing material that came with the box. (In fact, I put it back in the packaging after checking it out and mounting the bracket.) This will almost certainly be the easiest way of transporting the box in the future, and will assure that it stays relatively safe. It is a tad bulky, although I should be able to store stuff inside the box while transporting it, which makes it less of a waste of space.