I know that an inch here or there doesn't seem like a big difference, but if you compare the volume of the two there is a difference of 297.5 cubic inches. That's a big difference when you are considering how much can fit inside! Thats bigger than an extra bag measuring 10 X 7 X 4, like a Cammie or something!
The small Camille would have a volume of 1102.5 cubic inches vs. the regular Camille which would have a volume of 1400 cubic inches.
Also I think the measurements given are correct. From the pics posted it looks like Iluv is just measuring a little differently than they probably would to post on the site. For instance, measuring all the way across the bottom instead of measuring seam to seam.
it's so sexy when you talk math.