I ordered this bag for a specific trip to northern Italy, it was exactly what I was looking for at the time... Maximum bag size for overhead carry on, and backpack form where the straps could be hidden away. This bag met those requirements, and looked pretty good in the ad.
Upon receiving it I seemed pretty durable, it has three compartments, the main one, the front flap, and the little pouch. These compartments worked out pretty well for what I needed, main for clothes, front for travel docs and larger electronics, and the little pouch for small stuff like phone chargers and cables.
Additionally, there is an internal padded separator in the main which is intended for a laptop, but I didn't bring one, so I just used it as a space for clothing, later for separating clean from soiled clothes.
I was easily able to pack for 6 days in this bag and could have jammed in more.
Our trip was multiple flights, multiple cities separated by various train rides, I really liked being able to sip away the backpack straps for jamming it into overhead compartments, so they wouldn't get tangled up in stuff. Overall the bag worked out great, I am going to make this my #1 go-to bag for trips of less than a week.
On the down side, three items worth noting; (1) Access to the main compartment is through a single slit opening along one side, so the bag cannot be flapped open like a clamshell. This did not bother me too much, you just need to slip stacks of stuff into it in an orderly fashion. (2) the front flap could use a few more separations, without which everything slides to the bottom (when using the backpack straps) making them difficult to dig out and piling up behind the small pouch making that space smaller. (3) Because its a significantly larger soft pack, it conforms to your back and that gets pretty hot in any warmer environment, this obviously a small price to pay given the goal was to maximize packing space in a carry-on allowable size. The resolution would be to have a frame pack, which was antithetical to my goals; soft, max space for carry on.
Following that first trip I can confirm the durability of the bag, its held up great, the heavy duty canvas, leather design, and large/heavy zippers are built to last.
As a final note, on my last flight home, on a smaller regional jet, the airline identified and made everyone with a rigid or semi-rigid wheeled carry-on check them due to the limited overhead bin sizes. I sailed right past that and easily smashed this bag into the undersized overhead compartment. WIN

Bought 2 of these for our UK two week trip. These worked out great. Kept dirty hiking boots in bottom shoe compartment while jumping on trains, and the backpack style straps can be concealed with a zippered flap for easy stacking or handing to couriers. There's also a padded sleeve inside for laptop and front zippered pouch for documents. It was easy to carry in areas that wheeled luggage just doesn't make sense.

Quality and looks of the product are amazing

This bag is the close but it doesn't quite meet my needs.

First, I love the handles everywhere! That is profoundly useful when you're hopping from planes, to taxis, to trains. You can grip this thing from any angle and get it moved to wherever.

I love how durable this thing is.

I love that it is attractive without being flashy. I dont want bright colors and fancy materials. I dont want a bag that says, "look at me i am full of valuables!" I want a bag that sinks into the background. I travel a lot. Bags wander off or are cut and the only thing the police can say is that it sucks to be you. And it does suck to be you if youre living out a bag that has suddenly found a new owner. So I like that this is brown and just blends into the background.

I love the size. You can live out of this bag for two weeks. I have done it.

I love the straps everywhere on it. I typically keep this set up as a 48hr kit and it's nice to have straps that i can attach a tied and rolled up comforter too. Blankets aren't always available and I never seem to know when theres going to be an emergency and Im going to have to travel out of town and crash on someones floor.

I actually like that the front pocket is hard to get into. I can put things in that pocket and throw a small padlock on that amd hide the lock under the flap. It keeps the contents secure and it hides the fact that you want the contents of that specific pocket secure. Nothing says "steal me" to a thief like a easy to open pocket with a visible lock.

There are some modifications that I will make to this bag. Laptop sleeves are just stupid. They are a pointless advertising gimmick that bag makers put in their bags to show that youre getting a little extra something. The problem is that it is a little extra something where there shouldn't be anything at all. They did kindly construct the bag so that it is easy to remove with a seam ripper. I cut the sleeve out immediately. If i need a sleeve on my laptop, i will put my laptop in a sleeve. Otherwise it is wasted space and wasted weight and having one removes versatility from the bag.

The side pouch is pointless. There is nothing that can be put in that thing. It is canvass and it lies flat against the side of the bag. I'm going to slice that down the middle and install some brown elastic so that i can store a water bottle there.

The waist belt is a bit... short... like a lot short... I could lose a 100lbs and not fit that thing. At some point I will extend it.

My final complaint is with the zipper. If the main zip went all the way around, like a clamshell, this would be the best bag ever. The side zip doesnt quite open enough to get things in and out smoothly. I will take the bag to a local luggage repair company and see if they can modify the bag to have a zipper all the way around.

Is it the best bag on the market as of the writing of this review? I think so... But there is a lot of room for improvement. The bag market is flooded by bag makers who, apparently, have never traveled, never lived out of a bag, and possibly never even used one. Witzman does give me a little hope though. If any bag manufacturer reads this and wants more details on what travelers actually need from a bag, feel free to reach out. I can help design the perfect set of travel bags.