Going in a totally different direction, I always like having my admin shit in a pouch behind my mags. Currently I do it with everything in a WITR notebook in their zippered cover with a few chemlights taped to the back. Pen, Pencil, sharpy, plus a couple of reference cards, and I've shoved in a pack of map markers too. Currently I put this into the center chest pouch on the USGI TAP, but in the past I've just shoved it in the side of my cumberbund, or a cargo pocket with my map, or whatever.