I toyed with the idea of using 35cm as a diaper bag for the longest time. The 35cm itself is already heavy, wouldn't it be heavier with baby's stuff in it?
Depends on the leather, I guess. I'm using my 35cm box as a diaper bag more than the togo or fjord ones. And also, depends on what you fill it with.
I hang it on the stroller and it's perfect for when I need to reach in and get a toy or something for DD.