The new wave bag from anthro that someone posted in another thread looks medium-ish also... going green, obvious affection, bento box is smaller, two parts punk, sly devil, social circuit, favorite bookend is a similar size to the minilisa!
The French Nanny is bigger than the Immeasurable (I have both). The Immeasurable is on the smaller size of Tanos and has a snap closure and an outside pocket. Love this bag and carried most of it last summer. I also have the Case In Point, which is just a tad bigger than the Immeasurable. The CIP is bella leather (the other two are crunch/lux) and has 3 separate compartments.
I would definitely chime in w/ Sexbomb as medium sized. I just got my 1st one (just as they're phasing it out, of course!) and it seems small next to some of Tano's larger bags!!, but I've just been buying bigger and bigger bags. IMO, Sexbomb=medium.