omg. I've been retired to long. I like the bag izzy found. I need to work again. and grnt and scratch. Lol. Honestly, when I started using a nmessenger bag here, a tactical interior model which looked normal from the outside, it was met with less than steller enthusiasm. Ridicule and disrespect were far more common. Blackhawk mahe some very nice small bags I remember a compact vertical fanny pack meant to be worn at the small of the back. It had a main compartment, a front zip pocket and a water bottle and couuld be worn directly on ones belt. If i remember correctly it would hold what you have described.