http://www.petsmart.com/global/produ...=1131741093115
This is the one we use. It has worked for Shelby since I got her, less than 2lbs. She is buckled in so I loosen the tie so it falls lower and she can see out without standing up. Now she is larger (3+lbs) she loves to drape both of her paws over the edge. We use it whenever I take a long walk and we used it on hikes in the summer.