I have a Celltei bag for Ceiba and I get tons of compliments on it. It's very functional, durable (so far!) and good looking (well, at least *I* think so!).
HERE is the website.
I have the Classic Pak-o-Pet in black. Plenty of space for all my junk (and Ceiba's!). I think the thing I like best about it is the water bottle. It has a space built in for it and the water bottle doesn't leak!
My Ceiba is currently 13 wks old and weighs (as of last Weds) 2.11lbs. She has plenty of room in the 'XS' size carrier. (Dimensions = 12.5" L x 7" W x 10" H)
Happy shopping!