[M_Six]

Camera sling bags like that have been around for ages. They have quick camera access options as well.

The only things I have to carry that don't have a good place to do so are my iPhone and sunglasses. During the cooler months I usually have a sweatshirt or vest with a pocket for them. But in the summer I wear polos or tees and they don't have pockets. I can use the front pockets of my pants, but that's not as comfortable. I should probably consider cargo pants or cargo shorts.