Our 5 year old 22# Jack Russell had never been in a crate before, not traveled on a plane. We are now a 1 dog family and wanted to travel with him. We chose Roverlund based on design and reviews, and quite pleased we did. Granted he is not thrilled with being in a smaller space as he’s footloose and fancy free, but we worked with him the week prior and we were able to get him all the way in with coaxing and treats, and a little pushing, LOL. He traveled quite well, and fit under the seat on Delta…barely. Being he’s 22#, we also got the Ready to Roll base, for rolling through the airports. That helped a lot. Trying to figure out the best way to roll it as it tends to wonder some side to side in transit, which he’s not thrilled with. Otherwise, highly recommend this combo.