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While I prefer the look of the structured purses many have posted about, I don't like carrying everything on one shoulder. So I found a bag that works as a backpack, but has a compartment for you to tuck the straps in and carry as a briefcase.
This one is actually my daily cary bag, I have yet to use it as a diaper bag, but it seems like it would be very good at filling that role. [link]