"It was plenty big enough for my 22lb Pug to stand up and turn around in, but he hated it and he clawed holes in the netting -- the side pocket isn't a pocket anymore.
I primarily chose this one because of the wheels because I have medical issues but I ended up having to carry it as pulling it caused it to turn over at random, which really upset my Pug.
Plus, it did not fit under any of the seats on any of the flights I was on, which caused me much trouble with the flight attendants, who informed me that I was causing a fire hazard; plus it made my medical troubles extra exasperated due to the discomfort of extra less leg room.
I have to purchase a brand new one this year since the one I bought last year is beyond repair anyway so I'll be looking for something more sturdy that really will fit under the seat."