I have been through a number of bags looking for the right mix of qualities that i needed for my work and this is the closest i found.
It's tough and well built, so i think it'll last. The main space is good for my tools and you could fit a fair amount in it. A laptop a stationary section is separate in the next section. This mean your laptop does feel heavier than if it was closer to your back but there"s less chance of it being damaged by tools this way round so i am happy with it. The food section I actually use as a clean section for delecate items and the small pouch at th front is handy for quick get things like a measure or pass.
It is more convenient then some of my colleagues very expensive bags and I may by another for when this one breaks.
I use this bag every day for work. It has room for food, paperwork, clothing and a few tools. Very good quality. The cheaper bags are not the same (I've tried a few ). Should last for years.