Nylon lining Zipper closure Hand Wash Only Pretty durable with multifunction usage from Tilami armor bottom protection system, no problem rolling over rough surfaces Take much pressure off your back with the easy gliding handle and wheels Design of shoulder padded straps make your wheeling time more convenient and fun Dimension: 16*12.5*6", Fit well under airplane seat with the dimension of 16 inch Water can not soak through. The backpack fit for kids over 4 year-old.