After looking at all the great bags on here, I am even more confused, GM or MM. I carry a cabas mezzo everyday and LOVE it. The size is great for me. So I am used to big bags, I worry that the MM won't be big enough. The diamensions are 15.3"X14"x4.7" for the MM. The GM are 17.5"X12.8"X4.7". So not a huge difference. The main thing is that I want the shoulder strap to fit like the mezzo one, not cross the body. The handles would be for carrying them only for me, the rolled handles on a shoulder aggrevate me. I want the long strap to fit like a shoulder bag...if that makes sense. Can you wear the GM on the shoulder like a normal bag or is the strap to long? Then I wondered if I could take the long shoulder strap and have additional holes put in it to make it shorter, or would this ruin it? Has anyone done this before? Thanks again!!!