For my full day hikes, which will include different clothing options, and food and water for the day I use my Osprey 32. I use a Tenba messenger insert in the bottom of the pack for my extra camera lenses, flash etc.
Here is a shot of the insert in the bottom of my pack. You may notice that I have sewed a zipper so I can close the insert up.
I do some leather work so I made a holster for my tripod. I used to carry my tripod on the backpack, but it is much more accessible on my side. I also have a filter case on the same belt which holds my ND and CP filters.
Here is a shot of my holster.
I also made a leather holster for my camera, which fits both my 7D and 6D with my 24-105 lens. My camera holster also has a cover (not shown) when it is lightly raining, or the terrain might cause me to stumble. The holster also has a belt at the bottom that goes around my waist so the camera stays snug to my body. I got my idea for the camera holster from a company that makes them.
Here is my camera holster.
It is very comfortable to wear the camera holster, tripod holster, and backpack, and it allows quick access to both my camera and tripod without having to remove my backpack. I generally hike the more rugged trails and this setup allows quick access while also providing some protection. Even with this gear on I can use my hiking poles freely when needed.
Keep in mind that I am just throwing out some ideas here, and I don't expect everyone to be able to create leather items, but I thought another view on how gear could be carried while backpacking/hiking may be helpful.