Oh, Ludmilla... now I'm feeling guilty that I didn't do a reveal for my double zippy! The reason is, I got two bags that day (the other was not a Mulberry... shhh!), and I thought it would be a little "over the top" to do reveals on two bags; like bragging!

Thank you for saying you like my reveals... I promise you one in the future, when I get my next Mulberry.
It's interesting that you have heard that the D-Z is a heavy bag. I don't know about the large one (Izzy can answer that) but my small one, in polished goat, is incredibly lightweight... one of my lightest bags! If I weren't trying to be good about switching to a new bag every week, I would carry my D-Z all the time purely for weight reasons; it would make my physical therapist very happy!
As for the open compartment, this is where I keep things that I need to get to very quickly, like my phone, and also unimportant things, like receipts that I seem to collect during the day, and my makeup bag.
My only quibble about the small D-Z (and this might not be true of the large one... Izzy will know) is that there is
no little zip-up pocket anywhere for keys! This truly makes no sense to me. Didn't they talk to
actual women when they designed this bag? I have a car key which I keep separate from my ring of house keys, so I potentially have two different things that could either fall to the bottom of the bag and get lost, or fall out of the bag and get lost. Not good! My solution is to put all my keys in a little pouch, and store the pouch in one of the zipped sides of the bag (the side closest to my hip, which is the side where I keep my wallet) but it is an annoyance.
I hope all this has been helpful!