There would be pockets on the front flaps, you can see them crudely drawn in. Front and back of the flaps. Chem heat packs could be put inside pocket, leaving the outside pockets for your hands.

The back stash pocket could be used for, well, anything. A map. A snack. Or nothing. I just plan to put it there so people could have the option of using it. You could smuggle in a bag of potato chips to have something to eat while sitting in the bleachers watching a football game. Sneak a big bag of candy in to the movie theatre. I dunno. Stash pockets are endlessly useful.

And nothing is taken as a slam. I need somebody to bounce ideas off of. This is helpful. I have an idea in my head that really needs to come out. It is making me CRAZY. More importantly, I need for it to be practical and work.