I'll take a picture of it sometime but I had a bag made that is basically a rocketbox sling with a small captains bag attached to it. It allows me to strap in a small Engel cooler and still have some space for the misc capt'n bag stuff in the attached bag. I've also added a zipper bag under the capt chair for additional storage.
"It's supposed to be hard. If it wasn't hard, everyone would do it. The hard... is what makes it great."