I bought this and 2 others to see which would be best for my Coton who is 9lbs. We are bringing her out of the country for the first time. I bought the medium size which would fit under the seat of the airplane, and she did fit in it, however surprisingly it was a snug fit. The quality is average, I decided on the 7th Generation product because it was far better quality. This one would have been adequate, but I'd be afraid that a wheel could pop off or something compared to the 7 Generation product.