The Montana Elements Backpack is surprisingly large and my bag came in a striking blue; contrasted by the grey of an enormous number of straps and ties. I don't get the love affair of the straps some bag companies have; I'm never going to fill it with bricks so the weight of a small camera bag is never going to be so onerous as to need chest straps; heck i hardly ever use more than one shoulder strap.
The Mantona bag has a laptop like sleeve pocket down the back that can take a 15" macbook pro retina (just.) That is a big positive and speaks to the size of the bag; a smaller bag like a Lowepro Photo Hatchback 22L
can only take a small laptop or large tablet like a Surface Pro. Like the Lowepro the bag comes with a rain shell to protect it in downpours. The bag has choc full of pockets and sections; there is the aforementioned one for the laptop; a large daily pocket at the top of the bag; this has a zipped section inside. The large section has a bungee tie to close it up. The top lid clips over the bag and has another zip pocket in it. There is a large flap on the front of the bag; which worries me it would attract rain into it. One side of the bag has a pocket and straps for a tripod (or water bottle.) The other has a flap that opens to another smaller removable camera bag; which comes with its own rain cover. There are also two small zip pockets on the waist straps. There is a LOT of storage places all over the bag; though the top section would be more useful with some extra zip sections.
In the lowepro camera section i can pack a Canon 6d with a 24-105l lens,a gps sensor, a 16-35mm lens and an 8-15mm fisheye. When the bag arrived I used this Manfrotto Camera Backpack I
as my daily bag. This is tiny; can just take my macbook pro; as well as the 6d with 24-105, gps and 16-35mm lens. I wanted to spell out the capacity of bags that are all smaller than the Montana as the Montana's design means I can only carry the 6d and 25-105 lens. For a lot of people they only have one lens; so its ideal. Unfortunately I like to carry a range of lens to that make sense for what I'm doing that day. Having a bag this big that can only carry one lens doesn't make a lot of sense to me; the space badly shaped/ wasted. There is a photo of the 3 bags in a line below; the Grey Lowepro, the Blue Montana and the black Manfrotto.
If you only have or need one medium size lens on your sir then it is a great bag; and having the smaller take out camera bag (complete with rain protection) will let you take the bag away and only carry the camera when you need it. For you the bag is 5*
Whilst the other two bags I have of a similar style are tapered it is tubular and should have been able to carry a far more impressive camera load.
I really liked the bold color on the Elements backpack; i just think the design of the bag either the large laptop size or the design of bag inside a bag has compromised the storage. So if you, like me want to carry more than one lens then the shape is just wrong. For me the bag is 2*; so averaged it out at 3*.