My kg grandson's bag is big enough to hold his take home folder (standard pocket folder). It will also hold his library book and a drink cup. His is a backpack, but is made like a messenger bag, with the flap, so he doesn't have to fuss with zippers or snaps. I think it has velcro strips to keep it closed. If you do a flap, you could put their names so they are covered by the flap, but still be personalized. :-D