Great as a diaper bag.  I got an extra large matching pattern cosmetic case to hold diapers and stuff and instantly convert this into a diaper bag.  My kids are older now so I don't need to a luggage as a diaper bag.  This is light, padded enough, and normal size to be out and about with two kids in the big city.  I cannot recommend enough to use as diaper backpack.  It will be too small as a school bag, even for my second grader, so I would get the larger one for school use.  My other diaper bag is from Lesportac too, I tried other brands but this brand still the best in quality, most lightweight, and functional.