I recently made a couple of bags for an acquaintance. One of them was a modified Pink Chalk Studio Mail Sack. I prefer the pattern as is, but was asked to add a flap and shorten the strap. I wasn't keen on the strap modification, but, all things considered, think the bag turned out fairly well.
I recycled her husband's military uniform, cover insignia, and her father's uniform pockets and blousing strap. I used Anna Maria Horner's Loulouthi Clippings in Cherry for contrast.