My dog hate this bag and it has a very strong odor for some reason, she chew thru the side on first day! It is super big and didn't fit under the seat but lucky my dog is an emotional support dog so the airline let me take her out of the bag and sit on my Lap on a wee wee pad! So I can fold it and stuff it on the overhead compartment ! But it is so big that is barely fit up there! We throw out this bag after one trip, it was not easy to wheel it also!
After that I bought the INSTEN backpack carrier from Great Offer Stock without a wheel but much lighter weight and fit perfect under the seat for half the price ! My dachshund that is about 16inches long and weight 17 pounds loved that carrier!