I also have a Mono MM and I use it for everything; shopping, traveling, light school days, errands, etc. It's my most comfy and easy to use bag, super light too! Go for the MM, perfect everyday size IMO!
I love my pm...use it as an everyday day tote!!!
she's so light weight...just throw her on and off i go....everywhere actually.
I can fit everything i need inside and have room for some student files....
this bag is perfect and classic!!! Love it!!!!