We also have the Kwiggy Bo, the large black one, air at both ends, sooo nice, OK Sprocket is now 12lbs, a big boy, but he still fits nicely in the bag, can turn around, whatever, and when you think about the size you are going to buy remember, you also need to add to the inside a blanket of some kind, and a chewy or toy. Besides, a big purse is just that, mine happens to be the big black patten croc. Though it's a little pricey it lasts and the handles don't give out or the bottom of the bag. Remember basic math, cost of the bag divided by the number of years you keep it/use it, equals a cheap bag!!!! Atleast that's how I sold it to DH.