I've bought many pennants over the years, and always request this shipping method: place the pennant (in a plastic sleeve if possible) around the inside perimeter of a box the size of the deeper priority box. In other words, in a loose roll around the inside of the box. Then fill the middle of the box with enough paper (not newspaper if there's no plastic sleeve) that will keep the pennant firmly in place around the outside interior of the box. Similarly with posters and broadsides, I'd rather have them rolled up inside a tube than attempted to ship flat. No matter how strong the cardboard, a flat item of any size will have at least one amazing crease that it seems would have taken a man holding half of the package in place with his foot and bending up with the other half until the cardboard had been bent 90 degrees, with a similar crease now embedded in the piece. And writing "do not bend" anywhere on a package seems to pretty much guarantee this result. The loose roll in a large box method, on the other hand, eliminates the possibility of creasing a pennant and keeps the heavy paint on older ones from cracking. And it's certainly true that the incredibly strong glue USPS uses to seal their priority boxes can be a serious hazard to the contents.
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