Backpack advice needed

[MichaelT1i]

I currently own a canon camera backpack:

http://www.bhphotovideo.com/c/search...k&N=4291570227

That I really like and use daily. Problem is its pretty much full of camera gear, extra lenses, extra batteries, etc. Basically its pretty full. Problem is when I go hiking and need to carry, food, water, maps, maybe a change of clothes.... there is no room and so I need something bigger.

Anyone know of a better, bigger backpack that has a padded compartment for camera gear/lenses, and also a non-padded compartment for personal gear...???