We just got this sling called Fundel. I got the large one which can fit up to 18 lbs. So I put my 2 yorkies in it. It's one of the better ones I have seen as it is padded for their chins.
Kona and Yoshi in Fundel Slingbag 062609.jpg Titus1 in slingbag 62609.JPG
We have not used it yet, we just put them there to take these pictures.