I'm new to gucci. Love the marmont flap but cant decide between medium and large. Based on everyone here which looks nice. I'm afraid the large will look like a briefcase
Large is pretty big, you would have to try it on and make sure you like how it looks on you. If medium is too small to fit your things you might be better looking at another style, like tote?
The medium fits quite a bit, I think it may work for you... only way to know is go to the boutique and put all of your daily needs in it. I would go with the medium unless you are looking for a bag that holds your work essentials.