Our 3.5 year old is pretty tall for his age. He wanted a backpack. Backpacks for school-age kids are too big and the usual toddler backpacks are toys (too small to even carry much). This backpack is just the right size. It doesn't stick out to far from his back (not too deep), but could hold his overnight jammies, blankie, stuffed animal, toys and books and more. The zippers are easy for him to work. It has a "pre-school loop" to hang it up out of the way. The slightly padded straps are perfectly adjustable to his small frame. The 'Solar System' design is great and the fabric will hold up to his throwing, stomping, and 'blasting off' rituals. He puts it on and tells me he is a big kid ready for the school bus.