I have been on the search now, for awhile..(atleast 4 months) for a great carrier if I need to take Gucci with me somewhere and I have FOUND IT.
The company is called EGR Italy, I have had this bag about 3 weeks now and LOVE It, Gucci has gone to Joann's fabrics with me, the grocery store, to pick up my cutting table, lol, and she is as quiet as a church mouse in it, best thing, it is airline approved and it fits her SOOO much better than the Medium Sherpa we use for flying, I think the best part of it, is it has a hole on each side so they can stick their heads out and *see* what is going on (which is also closable), but it is convertable to be carried other ways, too. The next BEST thing is it is VERY LIGHT and comfortable to carry. Anyhoooo...If you are in the market, check it out! luggage.com has free returns and 10% off right now. It comes with adjustable shoulder straps, but its not in the picture I posted, its on the website, though
I think I might buy the snap on pet luggage that goes underneath it, it also has accessories to put it on your bike or a trolley, I have the silver one. I'm amazed I haven't been kicked out of a store yet with her in a tote bag! LOL People just smile.
I need to go give it a great review, because it is a great bag! I'd say the Large would comfortably fit a hav up to 12 lbs. and they can sit in a natural position.