Suggestions for big photography/climbing bags for long trips and everyday use?

I am looking for a 70+ litre bag that can be used as both a climbing and photography bag. I need a big one, as, I will travel and stay in destinations around the world for a couple months each. I will need a massive suitcase and a rucksack for this. If such bags exist, are there any suggestions for good bag models at good prices ?

North Face USED to make really burly expedition duffels. I have something called a Rolling Thunder(18 years old), good size and really built for airline abuse. You may want to check it out.  Also, ask on the Himalayan Mountaineering boards...they have experience with what works and what doesn't when packing for an expedition. Outside Magazine has some rating for large duffels...​Duffel Reviews​​​.

Check out the f stop bags. They fit the bill. 

Ok, thanks a lot guys!