Wheels are no good when you're walking up a dirt road!
In my opinion wheeled bags get in the way. If im walking about with it i would rather it on my back than wheel it everywhere.
All the people who travel to Thailand and all. A question to you is why you don't take wheeled square cabin size bags for such trips. I mean is it really necessary like you have to walk with this load on your shoulders?
Got the fair point 40, amazing, taken to Japan, Iceland, Amsterdam, South France. Don't need hold luggage.
This is a really great bag, I've had one for a couple of years and it is so practical and hardwearing. Never had any issues bringing it as carry-on luggage