I second Gunflint Charlie's suggestion, look at the Pella line. I don't know the model of my vest but is a more substantial version, has an excellent suspension system, holds two 20 oz. water bottles---one for me and one for the dog--- and has a deep back pocket for a rain jacket or snacks. Based on what you've said it may be a bit more than you want but their line of vests is excellent. My hunting involves some LONG walks for ptarmigan and prairie grouse so I like to leave the truck with everything I'll need for the day.
Steve