I have owned this camera backpack for over a year and the criteria for me was a camera bag had to hold a drink bottle, small travel tripod, be lightweight but strong, protective storage of my camera gear and space for some clothing, snacks etc for hiking and general travel and of course be comfortable to wear.
The F-Stop Guru is perfect for my use of amateur stills photography, carrying 1 Olympus OM-D E M1 II body, 12-40 f2.8 lens, 17mm f1.8 lens, 60mm f2.8 lens, spare batteries, small flash, filters etc.
I opted for the Small Shallow ICU which fits the above equipment and provides plenty of space for extras in the top area while travelling. It also holds my iPad but will fit a small laptop. It will take a water bladder but I prefer a separate water bottle.
I use the waist strap as it takes the load off my shoulders but I find when I go to clip it together, it becomes a bit loose so normally have to tighten each time, not a big issue though and only a minor gripe.
I like that the camera gear access is via the back and general access to things via the top. It sits upright and doesn’t roll over when placed on the ground. The construction, materials, zips etc are very good, I have had no issues with the quality.
I don’t believe there is one magic camera bag for everyone but if you are considering a dual camera bag and travel bag, I would recommend checking out this or any of the other F-Stop backpacks.