Have to say Adam you are correct, you by far always have the best players pack for SC doubles each year!
What I thought would be a good idea is get some of the mini clipboards, from Walmart, Target, Staples, etc... and put a disc golf sticker on it, <innova, Discraft, etc..>. That way it LOOKS like a players pack, but in fact you have little to no money invested in it, other than the time to put on a few stickers. I did this for my own bag last year, bought a plastic $1 clipboard, put on a sticker that I got from the Tim Selinske Masters, and it looked like one you'd buy from a DG website. Even got a few comments on "where can I get one of those from?"
The bottle openers, towels, pencils, sharpies, all great ideas, and things that can and will be used. Adam your idea about the sander is also great! I keep one in my bag as well, but got one of the 3M ones from Lowe's.