small size 10" wide 12" tall 3.5" deep not meant for school, does not fit folders better for park zoo bike adventures walks around the neighborhood or pretend play my kiddo carried his own water bottle and snacks, lifesaver for mommy :) in excellent pre-owned condition, gently used, no flaws for train fans everywhere choo choo adjustable padded straps top loop for hook hanging side mesh and velcro pockets