Yeah the small size. And I didn't have a bad experience, I am just used to the subpar quality of Chanel. The 19 always looked and felt plasticky to me, whether lamb or goat, but I was wiling to endure the sight pollution of that for the functionality of it. So the structure loss isn't what you are referring to above with the larger sizes. The structure loss I am referring to is that the bag molds to its contents. A large wallet, a small O case, those things can "round" the bag so that it just rolls off of everything. I got sick of it rolling off tables & having to prop it up so that it wouldn't roll back or forward. That is to be expected of a nonstructural bag lined in fabric tho.
Caro is thick lined in leather, and the outside leather is also quite thick and supple, so (IMHO) the bag functions like it should. But hey, ppl love the 19's they are VERY available in a ton of colors all the time, and they are producing loads and loads more each season. Clearly it's a great bag for many!!!
I just sold the 19's and replaced them with jumbos, which is what I really like the most from Chanel anyways. All good!