You're so right. I have so much stuff in my MM with tons of room to spare. When I was in store I didn't even consider you can slouch the bag (duhh) to make the strap drop longer lol. I wish I got the pm instead . Too late now lol. I think having the long strap would look weird on the MM, but for the PM it would look awesome!
Yes lucky my SA showed me how to fold it over to create more space but still don't think I will be able to wear with a big coat. maybe if it softens up and sags more.