A blank is provided for making an insert that satisfies the USPS requirement that a flat-sized mail piece be uniformly thick so that any bumps, protrusions or other irregularities do not cause more than ¼″ variance in thickness.
In one embodiment, when folded, the blank forms an insert with spacers about a quadrant that receives a good to be mailed.
In other embodiments, when folded, the blank forms an insert with sleeves into which goods may be slid, or an insert with sleeves with closed ends and into which goods may be inserted into cutouts in the sleeves.