it seems a bit strange that they would come out with a "small" version that is so close in size to the original.....
Shoptwigs provides these measurements for the Small: 10.5"H x 15"W x 7"D 5.5" Drop
Measurements provided for the original Camile: 12.5"H x 16"W x 7"D 6" Drop
Not a lot of difference really.... But when I looked at pics of the two, the Small appeared to be less tapered toward the top of the bag, and had more of a square look to it. Just my observation from looking at website pics, though.