I bought this one
http://www.sherpapet.com/products/de...ddetail_post=Y
I looked online and found it for $50. I also bought some of those super absorbent soft pads that you can put in the carrier, the small fit perfectly in this carrier. It goes right on my back and its big enough (barely) for my 2 boys. One is 8lbs and the other 5lbs. I mean its a bit tight, but this is the biggest bag you can bring on the plane so Im stuck with it. They will be ok bc its a short flight... 2 hours, then a 2 hour layover, then 2 hours. They can hopefully handle that!