I think you could fit all that in the lowepro
Fastpack 350. I posted a picture of mine and described my setup in there
in a blog post. For travel, it's a sweet setup, as a dedicated hiking pack, I'd look at some of the other lowepro models 'cause this pack doesn't allow too much extra gear, after filters and accessories, rain jacket, stuffable rain cover for the pack and lunch pretty much max out the pack. Also you have to improvise a good carrying technique for the tripod but it's doable.
I also plan to outfit one of my hiking packs to carry camera gear for more out-there trips where I need to carry more than camera gear and lunch. You can built pretty decent custom photo gear dividers using a cheap polyurethane sleeping pad and a hot glue gun (I've done it)... so you might want to get a mountaineering pack which suits your needs and dedicate one compartment in it to photo gear with a custom built divider.