I use an Osprey Stratos 24 with a Tenba BYOB 10 insert. I find that it's far more versatile than camera backpacks if you want something that will serve many purposes. It's also incredibly comfortable and you can buy a hydration insert too. All around great solution if hiking and photography are equal priorities for you. The Tenba BYOB 10 holds my X-Pro2, 16mm, 23mm, 35mm, and 56mm lenses. Cleaning kit and spare batteries go in another pocket. Plenty of space for snacks, jacket, etc. If you want a tripod you can attach it to the outside of the pack.