I received the 24/24 Size 21 yesterday. It's adorable
This is a bit of a bag review, so please bear with me.
I already own the 24/24 in size 29 and love it. It's roomy, sporty, and casual chic. It screams elegance, but not identifiable by maker-which is fine with me.
I love cross-body bags but I'm petite--by way of example, the Evelyne 29 looks huge and clumsy. Despite my frame, most small bags look like they're sized for a child. Somehow the 24/24 size 21 impresses me differently. Yes, it's small but its' depth gives it a volume that makes it look right.
To get to your question--it holds a lot! Every essential thing that I fit into the 29, fits into the 21. This includes my regular size Bearn wallet, a zippered nylon
Prada cosmetic bag (which holds lipstick, tape measure, pens,
emergency chocolate and other paraphernalia I don't want impressing against the interior of my bags), thin eyeglass case, mask and handkerchief. The back pocket handles my iPhone just as easily as the 29. The only thing not in there is my Calvi, which is so small as to be inconsequential. Everything is lined-up, but not tightly.
Having not used the bag yet, I'm not sure if I will have to remove everything just to get one thing out (this happens with my Trim Duo). It also may be, that once something is removed, everything will have to be precisely rearranged, which is not really what you want to be doing when running around. Again, we'll see. I think it will be better than the Trim Duo (despite its' small size things get lost in it), albeit at nearly double the price.
The only thing I don't love is the placement of the hardware for the shoulder strap, which causes the bag to pitch forward. The 29 version behaves similarly, but doesn't seem as pronounced. But oh well. I noticed however, that when arranged towards the side/front of my body, and not at my side, the pitch is counterbalanced and isn't noticeable. This is a design issue I can do nothing about.
Bottom line, it's a handsome bag, much roomier than I expected--in fact, the most roomy small bag I own. Hoping it will be great and user-friendly for traveling and running around.