It’s pretty sturdy, in my experience. I travelled with it for the the first time a few months back and had an issue with the power cord coming loose from the power brick, which required removing a couple of modules to access and reconnect it. That was the only serious issue I’ve ever had with it, but I’m not the least bit surprised that it came loose considering the bumpy flights and long-distance bus rides it endured on that trip.
They also have a larger version of this case which looks like it’d be perfect for touring modular musicians or people trying to easily transport 12U worth of modules in a durable, waterproof case.
https://trogotronic.com/product/m420-collier-case/