This cat carrier with wheels is excellent.
I loved how sturdy this carrier was. It sags a little with a heavy cat atop, but I don't see it breaking anytime soon.
I liked the design and its customizability. The handles and straps can be hidden or stored without getting in the way, and you won't lose them.
The dolly was surprisingly good. It fits the carrier perfectly and is equally strong. The wheels are very smooth and glide effortlessly. The only downside is it doesn't have locking wheels.