I bought this bag from PetSmart, but my dog is too big for it. I have never used it, I actually just got it in the mail Monday. It is airline approved. The size of the bag is Medium (18"lx10.5"hx11'W). I paid 59$ for it, but am selling it for 45$. PM me if interested. I will pay for shipping to get to whomever buys it.