The AMP 3 kit is very similar to the bag that I carried for years. Mine was a clamshell that unzipped and spread flat so that the contents were visible. Rather than pockets, it used elastic loops to hold items, thus enhancing their visibility. I eventually sewed up my own version which is still in use as my vehicle kit. Definitely stay away from pockets; they conceal to much and someone else might be delving in your bag for a desperately needed item (in the rain, in the dark).

I eventually added a small, free floating bag which contained the items I would need right away (BP cuff, stethoscope, gauze). It simply floated loose in the interior of the bag. I kept carabiners handy so that it could hang, if needed.