I don't actually own this, but I wish I did. I saw this
Blue Q airmail zipper pouch at a local gift shop and just had to take a picture. Too bad I didn't get it... I may yet do so. Wouldn't this be a perfect pouch for your traveling mail kit? It's 9.5"w x 7.25"h so it would be big enough to carry some stationery and stamps, and even a few pens. Oooooh la la.