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I have the 3n1-30. I haved used it for 2 years and carried it about 1000km and lots and lots of elevation gain. It is big enough that I often carry 7d,5dii, 24-70, 17-40 and 100-400. And spot, iphone, ... and rain protection and sandwich and water.
It is not a perfect bag but nor are others.
The straps tuck in, it goes under an airline seat and overhead as well.
It is adjustable with a stomach strap.
The two things it does not do well are:
1) It is not easy to attach a tripod - there is no obvious spot to hang. I bought a gitzo tripod strap and attached it to the handle and use a bungee cord to keep the tripod from bashing my legs
2) It is not a snug fit and sticks out a bit on the back so you have to be a strong carrier but if you want to take as much as I do, thats just the price of bringing a camera.
I just bought the 3n1-33 (which also permits my laptop) because I like the 3n1-30 so much and want to bring my laptop too.
I have yet to find a better bag, but if I was on a long distance hike that required a sleeping bag and tent, I would lighten up and bring a real back pack.
So if you are looking for the best hiking bag, keep looking. If you looking for a does everything bag, this is it.