Hi Bag wifey, I had that problem too and after buying and loving the medium 2jours so much, I decided to treat we with a small one as well...
I just wanted to take a look at the small one, I thougt it was just too small, but after I tried it on I absolutely fell in love
all my stuff fits in it, so unbeleivable, even my pocket umbrella and big LV Wallet and everything else!
After carrying the bag around a few days I really dont get it why I ever thougt it was too small
I can´t fit in a bottle of water, sure, but so I carry a lunch bag to work now, no point squeezing food and beverage into such a beauty anyway, right?
So I say just try it out if you can, just see what suits you best and how much stuff you want to carry in your new lovely
Fendi
Good luck with your decision