What I like about the Acorn bags is that they have pockets that face toward the back. So you could easily access items like a camera, gels, phone that are stowed in those pockets. The problem with Acorn is that it's a home business and supplies are limited, so you have to place your order at 12:01 am on the first day of the month to even have a shot at buying one.

I own two Acorn bags and they are extremely high quality, best I have seen. I would own more of their bags if not for the aforementioned ordering difficulties.