Thomas & Friends Medium sized (12 inches) Rolling Backpack Rolling Backpack Dimensions: 12"T x 9"W x 4"D Backpack is constructed of long lasting and light weight ballistic nylon (canvas like material). Wear it on your back or pull out the retractable handle and roll your stuff around on the built in wheels. 2 Pockets: Full Sized and an additional attached half sized zippered pocket in the front Great for pre-K and K Grader