This is the best pet carrier ever...I have an 18 pound cat and lugging her around in a hard crate was hard on me and my back! I was concerned that this carrier might not be quite big enough, but it's the perfect size.  And now I can roll her along with me, which is much easier for both of us.  It's unlikely I'll use the shoulder strap or backpack harness, but one couldn't ask for a more versatile carrier, and the price was fantastic! Thanks, Wayfair!!!