Hello! So I’ve owned this since my about 10 year old dog was a puppy but she was not a huge fan of it and then ended up being dog reactive so there’s just not a lot of times I’m biking her somewhere—tldr this cart isn’t new but it also has only been used a handful of times ever and has otherwise lived in our garage. There is a hole in one of the mesh windows from her trying to escape with her teeth the first time I towed her! Otherwise a little dusty but in good shape. It mounted on my mountain bike using the pin that holds the back wheel in, not sure if there is any other way to do that as some bikes might be too narrow. $100, in Missoula.